Disclaimer: Links on this page pointing
to Amazon, eBay and other sites may include affiliate code. If you click them and
make a purchase, we may earn a small commission.
Hey, Welcome to the forum from Reno! I was about to ask what elevation you were at. I guess it depends on your application, the 750 should be enough for all those cubes I would think. I am running the Carter Afb (eddy 1406) on my 305 and its plenty of Air/fuel.
I had a 468 BBC with 10-1/2 to 1 comp, rectangular port heads and the cam was a 611 lift with a 310 duration, a single plane intake and an 850 holley and it was the perfect size for the engine.