[piecesparts]

Look at the Edelbrock AVS line of carbs. The AVS model is rated at 650 CFM and not the 600 CFM the others are. That is a good sizxe for all around use. A 750 workis great on a smaller sized vehicle, but looses efficiency on a heavier vehicle on daily street driving. This info is not of my dream factory, I got it from all of the different tech gurus from Holley, Edelbrock, Barry Grant, and etc... The heavier the vehicle the more air signal (NOT total air flow capability) is required to make it operate efficiently. That means a small CFM rating will keep the air signal higher and thus make the carb work better moving that larger load. However, this will cut the top end capability to some degree, so get a little and give a little.