Carb choice on my new intake

Without a few informative facts, it's a possible error on the side of caution along with the ceiling in RPM eing turned not exactly gobbling up more cfm than the carb is able to give, or able.

If you were willing to twist it up to your peak RPM power output plus 2 - 3 hundred RPM at the finishline, then that would be a 750 cfm choice.

Old age.... OK, I admit it, I'm starting to grey...LOL!