Cab,

You might benefit from running the larger center carb. I purchased a 500CFM Holley Carb with the full round air cleaner horn on top. We installed the six pack carb throttle arm and milled the air cleaner bell to the same size as our 6-pack carbs. It definately shoots more fuel.

Before trying it myself, I borrowed a friend's set up. My car picked up two tenths with just this mod. Tom