If you're not lookin for a numbers matching Q-jet, there are lots of places to buy. If you want something similar, any '68-'70 Pontiac Q will look similar. And they are the same 750 CFM size. But, since these carbs came on 1st gen Birds and '68-'70 GTO's, many rebuilders try to overcharge for 'em.
Here's one that should be clean enuff to make a real good rebuild core. Just update with a good rebuild kit from Cliff Ruggles, and it should be good to go.
If you want one that looks similar but is an 800cfm model, you can buy an early 70's 455 Buick carb. Everyday Performance shows several of these Buick carbs.
At the time I'm posting this, Everyday shows a '71, a'72, and a '73 800cfm Buick GS455 Q-jet. Are they REALLY 800cfm ? I have absolutely no idea. Are the carbs they have, really the numbers they list ? I have no idea. There is all sorts of wrong and misleading info on the net. The carb numbers they list are 7041540, 7042240, and 7043240.
This article says the 1970 GS455 also had the 800cfm Q-jet. Is this info correct ? I don't know. I suppose if you look up enuff Buick info online you can eventually come to your own conclusion about which years and numbers of Buick carbs were 800cfm.
On page 9 of Cliff's Q-jet book, he says that the '71 Buick 800cfm Q's were the 1st 800's produced. So, I assume that means that many of those carbs were actually made in 1970, then used on '71 model cars. I can't confirm any of this, as absolute fact.
Or, if you don't mind having a later model Q, the '76-'79 model Pontiac and Buick Q's are 800cfm and have the APT adjustment, which is a desirable feature. The Pontiac models have a huge "smokestack" vent, which requires a hole for it in your air cleaner base. Or you can buy a Buick model, which doesn't have the big vent.
At the time of this post, their website shows that Everyday has a '76 Pontiac model in stock. It appears that a direct link to the carb does not work. So, to see this carb, you'll have to go to the Everyday home page, then click on page 2. The '76 Pontiac carb is near the bottom of page 2.
SMI is a Q-jet rebuilder with a very good rep. They show to have these later model Pontiac and Buick Q's. And they probably have some of the older cores also. Have no Idea what's actually in stock.
I've read some good reviews of the Jet brand Q's. Their #32102 Stage 2 800cfm Pontiac model appears to be a BOP model without the "smokestack" vent. But I don't know if the carb pictured is the actual product you'll get. The B & O model looks to have the same pic. So, you may need to buy the B & O model to avoid the big vent. It's part #32002. The price is $390 shipped, from Summit, Jegs, and other places. The best shipped price I found is about $370. The carb pictured is a #17057258, which should be a '77 Olds model.
And, of course, Ebay has lots of 'em, and Summit can order a Uremco brand. At the time of this post, they actually show that this 1st one can be shipped Mon Aug 3.
Edlebrock also made their own Q-jets for several years. You can still find some of these for sale, occasionally. There were 750cfm, 795cfm, and the #1910, which is advertised at 850cfm, which some dispute. These E-Q's are good carbs, but they do have the Chevy style, passenger side fuel inlet, which some Pontiac guys don't like. There are usually some E-Q's on Ebay.
The carb numbers they list are 7041540, 7042240, and 7043240.
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