what CFM would you use here

I am changing the carb on the Dart Sport. it has a 2Bbl. on it now. It is a 360/904 daily driver.It has a mild cam in it. It does not have enough *** for me. I am thinking of going with a 750CFM. It that too much or would you go with a 600CFM. I am thinking of using one of those 2BBL. - 4 BBL. adapters and slapping a 4bbl. on it. thanks,Bill