Summers too short to diagnose my carb problem, so I am just going to buy a temporary replacement. I am looking at buying a Summit remanufactured Quadrajet. Any thoughts on this? Its a 750cfm with the divorce choke. Thought about just slapping on an Edlebrock but wasnt sure what CFM and they didnt have a divorce choke. Should I not worry so much about that? I am just looking for something to run right out of the box!

Stock intake? If so then the quadrJet is the way to go so u don't need an adapter.

Not many carbs will work perfectly out of the box. MOST will need adjustments.

SMI gets good reviews.

http://www.smicarburetor.com/products/sfID1/28/sfID2/9/sfID3/100

So does Everyday Performance. You'll have to contact these carb rebuilders to see if they have a core of the exact model you want. Usually the correct number for a late '60's Bird or GTO will come with a premium price tag. But, there are other numbers that will run just as good, when correctly rebuilt.

http://www.everyday-performance.com/quadrajet_carburetors.htm

If you want a divorced choke model carb, but actually prefer an electric choke, They also sell an electric choke conversion.

http://www.everyday-performance.com/electric_choke.htm

I don't know how good the Uremco carbs, that Summit sells, are. Some models are cheaper than many of the highest rated rebuilders. But, one listed for a '68 Bird, has a $180 core charge. and shows a shipping date of 8-29-16, if ordered today. And there is no guarantee that they even have a correct core to build. Not sure what you'd get--IF--or when. ?

http://www.uremcoinc.com/carburetors/view/37318

https://www.summitracing.com/parts/urm-1...OkVMaAlot8P8HAQ

The later model Pontiac carbs, such as '77-'78 models are cheaper than most early units. But, they have slightly different linkage, hot air or elec choke, and are 800cfm. In other words, they won't look original, may required slight mods to the throttle linkage, but might be functionally just as good or better.

http://www.uremcoinc.com/carburetors/view/37711

Summit appears to have one of these in stock. As you can see, these Pontiac carbs have the big "smokestack" vent, which requires an air cleaner base with a hole in it, for the big vent.

https://www.summitracing.com/parts/urm-14-4200

Other GM Q-jets, such as a 403 Olds, has the front inlet, but does not have the big vent. These type carbs are shown in the SMI link I posted. Here is a Uremco model.

http://www.uremcoinc.com/carburetors/view/35919

https://www.summitracing.com/parts/urm-1...G_rgaAmDe8P8HAQ

There are some early models on Ebay. But they ain't cheap.

And, as you can see, the links won't work. But, you can go to Ebay and enter 1969 Pontiac Q-jet, and find some. No idea about the quality of any of these. ???

http://www.ebay.com/itm/1969-7029268-0779-DATED-PONTIAC-Q-JET-400-455-ENGINES-AUTO-TRANS-RESTOD-/281563338130?hash=item418e7b9592:g:GDAAAOSwmrlUts3P&vxp=mtr

http://www.ebay.com/itm/1969-PONTIAC-ROCHESTER-Q-JET-CARBURETOR-7029263-VO-fits-350-400ci-M-T-5819OE-/331899637133?hash=item4d46c28d8d:g:0XQAAOSwzJ5XUey5&vxp=mtr

http://www.ebay.com/itm/Restored-1969-Pontiac-QuadraJet-Carburetor-/291819444299?hash=item43f1cb584b:g:UskAAOSwsTxXiON1&vxp=mtr

Here's a couple of '68's.

http://www.ebay.com/itm/1968-PONTIAC-GTO-ROCHESTER-QUADRAJET-CARBURETOR-4bbl-350-400ci-M-T-7028269-VE/331898917468?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20160617090737%26meid%3D48b1b1f0322a4e2da5cdddb5ff1af49b%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D232008505278

http://www.ebay.com/itm/1968-Pontiac-400-428-CI-Quadra-Jet-Carburetor-7028262-Restored/232008505278?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20160617090737%26meid%3D52dc74f0491c42cbbdb218cb658dc58c%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D331898917468

Jet sells Q-jets. The pic of those they list for a Pontiac appears to be of a '77 Olds carb. So, I don't know exactly what you'd get. ?

http://www.ebay.com/itm/Jet-Performance-...725.m3641.l6368

https://www.summitracing.com/parts/jet-32101

this is the one i am considering, looks similar but the fuel line in is not coming straight in the front

https://www.summitracing.com/parts/sum-210210

i was considering a non stock replacement to temorarily get me through but how many CFM?

I am also trying to decide if the aftermarket carb needs an adapter? Is stock intake considered a square bore?

Anything but a quadrJet or Holley quadrJet replacement needs an adaptor. Check the summit catalog for the Holley quadrajet replacement. That may be the easiest and cost effective solution

Listing calls it a Chevy 750cfm. It will bolt to the stock Pontiac Q-jet intake. But, you'll have to do some plumbing for the side inlet. And, will probably have to modify the throttle linkage to connect to the Chevy throttle lever. Would be a little easier to buy one with a straight front inlet.

New spreadbore Holleys ain't cheap. Probably not a good choice.

https://www.summitracing.com/parts/hly-0-6210

https://www.summitracing.com/parts/hly-0-80555c/overview/

Ebay lists quite a few used and rebuilt. A 650 is big enuff for what you want.

http://www.ebay.com/sch/i.html?_from=R40...amp;_sacat=6000

there is no a carb you just pull out the box an bolt right up an run with no problem. They did that to my car before I purchased it.
it was way off with a lot of adjustment. It was an eddybrock, that need to be rejeted. Did the work to rebuild it an set it up for the
work that was done to the motor. I was thinking of trying to go back with a qjet but a lot of items would need to be changed.
The car runs good like it is, so I just enjoy it like that.