need help asap what carb for my motor 600 750?? edelbrock

based off of your cubic in's and rough estimate on your max RPM the average cfm for your setup would calculate out to
Street Carb CFM : 501.74 Racing Carb CFM : 649.31

So I think a 1406 would be a good carb for you...thats what I am running and I like them, easy to tune,street friendly,a little easier on gas.

if you were wanting a racier application I am sure you could get away with a 750 and you could probably tune it down a smidge to match your set up.....but for an out of the box bolts on and go done deal I say just snag an eddy 1406