Keep in mind that the Edelbrock carb is an AFB design. They were obsoleted in 1967 as the factory couldnt' get them to pass emisson standards imposed clear back in 1968!
They are just OK. The pro's for them is simple and easy to work on. The cons are ugly, too wide, woln't fit the stock spread bore intakes, fuel line clear around in the rear, and the BIG showstopper.......no adjustment for the opening rate of the secondary airdoor.
The Edelbrock version of the AFB, their "Performer" series carburetors are poorly constructed, and have a few built in design flaws. We will NOT allow them in our shop.
Edelbrock has made zillions of dollars on them for one reason, they are darn ars CHEAP! About all they are good for is moving a vehicle from point A to point B, IMHO.
Your factory q-jet is an excellent unit. It just needs upgraded with modern components for this new fuel. I would completely/correctly rebuilt it with one of our kits, new choke pull-off, and put it back in service on the stock intake with the factory divorced choke hooked back up.......Cliff