750 CFM is probably larger than optimum for a streetable 305 CID. 750 CFM is good for 600 HP on a 427 CID V-8. That's what you would find on a big block setup.
That motor would have to be built to breathe way more than would be streetable (5:38 gears) for that combination to be right. 600 CFM would probably run better with less bog.
That motor would have to be built to breathe way more than would be streetable (5:38 gears) for that combination to be right. 600 CFM would probably run better with less bog.