Carburetor cfm calculator

when i first put the 440 into my old 65 dart i borrowed a 750 vs holley from a buddy. after a couple of weeks he got his car ready for the road so it had to go back and all i could lay my hands on was a 600 vs holley. the dart was noticeably more responsive but on the open road it was just as noticeable that it lost power above 5000 rpm. considering how often i would be driving above 5k i left it with the 600 and liked the driveability. if i was going to the strip fairly regularly then i'd have got another 750 (or bigger) but that wasn't on the cards. plus i liked the better economy too as it meant i could use the dart for work a few times a week too.
neil.