On your carburetor. There's certainly room for improvement. Carter knew this when they came out with the AVS as an improvement over the AFB. Look at where the secondary vacuum door location on each carburetor. On your 750 AFB, the door is below the boosters. The AVS improved this design by relocating the secondary air door above the boosters, so they are regulated by the secondary air door all of the time. This created a more smooth transition into the secondaries and generally smoother secondary operation. So I agree with rumblefish about the AVS. It's a great carburetor.
Don't put a double pumper on that car unless you want to slow it down terribly. Double pumpers are for manual trans cars and auto cars with loose converters and 4 and up series gears. The extra pump of fuel while opening the secondaries will slow your car down, not speed it up.
IMO, I don't think that cam change will make enough difference to warrent all of the labor involved. You have a camshaft that's IMO too big. With no other modifications, simply installing 915 heads probably brings compression up to 9.1 if you are lucky. So with that in mind, I think this is a better choice than the 484 or the Whiplash:
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=716&sb=2
It has a longer exhaust duration, so you will still have some bump, but the duration @ .050 is less and it is ground on a 110, not a 108. The 110 will give it a little better street manners and also bump the bottom end torque up and flatten the torque curve out more. Generally, 108 ground cams are more peaky with the torque curve and sacrifice a little bottom end for peak torque. With a street car you want the opposite.
