Quote Originally Posted by redrodman48
I goofed, it was a performer I was looking at, not the RPM, and the reason I
was going with 750`s is thats whats sitting on my work bench.The car came
with a 750 originally and worked fine. PS the 428 is a Pontiac, not a Ford

Either brand, Ford or Pontiac, volumetric efficiency is, well volumetric efficiency in general terms the same - a 750 is too big. But, with that said - your car, your performance and your gas tank that needs to be filled - go with it