I feel like this question will have been asked many times already, but I haven't been able to find much in the search... so here goes

I want to convert my '67 326 2bbl to a 4bbl. I've been reading around here and other places, and a properly rebuilt and tuned Quadrajet seems like my best option - over a Holley or Edelbrock. So I'm wondering what issues I can expect to run into? Obviously I'll be needing to buy the carb and a new intake. Provided I buy a compatible year/model QJet, will the fuel line reach the inlet? How about the throttle? Also, the vacuum lines from the intake - will I need new ones, or will the ones off my 326 2bbl work?

I will be buying a core and rebuild kit from Cliff's, as I've read good things about them, don't think I'll find a core here in the UK. But I would like to know what year/model people would recommend... Electric/Manual choke - was thinking of manual, but maybe if the vacuum lines won't fit, an electric will be easier.

Intake... I heard from this board that the stock Pontiac intakes are among the best. I will be needing a new 4bbl intake, so for ease of purchase was going to go for a Edlebrock - I doubt I would really notice a difference? The pictures seem to show threaded holes where the PCV should connect to, does the intake come with adaptors?

Feel a bit bad asking so many questions here, hopefully I can start chiming in soon.

Thanks so much for any help!

Lloyd sounds like you already know most of the answers. It's a fairly easy changeover. Your throttle linkage should be fine. Your fuel line should be ok. You may have to tweak it a bit to make it fit. Your choke will depend on what year carb you get. Later years ran a heat riser tube. Even later used elect. But not all setups will bolt on to the different year carbs. And a stock divorsed chake won't work on a Edel manifold. For tuning, I like the 75 and later qjets( not the computer controlled ones) with the APT. No, the intakes don't come with adapters. That's on you.
If you're wanting more power, becareful what you wish for. A brand new carb is likely to make the next weakest link in the set-up fail. It's hard to stay out of those secondaries once you get them.

IIRC the intake ports are small on the 326 2 bbl heads and need to be opened up to match a Pontiac 4 bbl intake. Before you get too far along you should measure your ports and compare them to some 4 bbl intake manifold ports.

I just put my 4bbl Pontiac intake from my 68 Firebird engine on my all original 326 2bbl engine. Intake matched up perfectly with the 326 heads and needed no modification at all. I have the original 2bbl Pontiac intake from this 326 as it was given to me by the original owner when I bought the car as he had removed it and installed an Edlebrock intake & carb. combo. I then removed the Edlebrock combo and installed my 68 400 intake & Q-jet.

Granted the Edlebrock combo ran well and I am sure was an upgrade from the Pontiac intake & 2bbl carb. However, when I switched from the Edlebrock combo to the 68 400 intake & Q-jet combo, WOW what a difference. The 326 runs 5x better with the Pontiac 400 4bbl intake and Q-jet 4bbl carb.

I would HIGHLY recommend looking for a Pontiac 4bbl intake and a rebuilt Q-jet if you are looking for originality or more importantly, performance. The only advantage the Edlebrock combo would have is their carbs are a breeze to get running. Simply take it out of the box, bolt it down and go. Whereas a Q-jet may need some tweaking etc.

Hmm... I would like a stock intake, not so much for originality, moreso because I just don't like the Edelbrock logo... But, as I'm in the UK and stand next to no chance of easily finding one over here, and I'm not optimistic about the shipping costs for a cast iron intake, I will go with the Edelbrock - I'm putting a large order in with Summit anyways.

About the adaptors for the PCV on the Performer intake. I see Summit sell threaded pipe barbs, so that's good. I've looked in the manual but I can't really work out the threads I need. The 2 holes do look to be different too. Do you know what threads they are?

For the QJet, an electric choke would be easier than having to worry with the hot air choke lines not fitting, not a big fan of how they work though. APT sounds good to have. Were there different models of QJet for Chevy/Pontiac/Olds/Buick? If so, I guess BOP will all fit?

Thanks for everybodies help as always!

Pontiac Q-jets have the inlet for the gas line right in front of the carb. The Edlebrock carbs have the gas inlet on the passenger's side of the carb, therefore you can not use a stock fuel line and filter, you will have to use a rubber line and an inline fuel filter.

I don't know what kind of weather you plan on running in but you probably don't even need a choke. I had the stock divorced choke hooked up for years and they work great once you get them adjusted properly. I have been running with out a choke and had my crossover blocked for a few years now and the car runs fine the way it is. It can take a couple of minutes to warm but no big deal. I wouldn't sweat the choke issue if it were me.