Carburetor cfm calculator

The question shouldn't what cfm you need since basically all carbs will only flow the cfm you need, carb ratings are basically meaningless, but what vacuum level am I shooting for, With a race only the question is what's the fastest, street strip whats the fastest with acceptable driveability, with daily driver street what's the largest I can go without sacrificing driveability. Sure you could slap on a small 2 bbl or 4 bbl and drivability will be fine but your giving up hp for nothing whole point swapping from a 2 bbl to 4 bbl in the first place on a V8 at any power level I've never heard any one complain the a 600-650 cfm being too big. A 750 cfm is a mixed bag but I feel most the are unsatisfied probable was more from poor tuning then over carbution.