ultimately the dyno or constant track tuning is the best. however since neither is practical the vac method will work. although the vac drops to sero when you hit the throttle it will start to climb as you go.
a 650 dp will probably be the best choice for you if you want to drive it. there are alot of choices and advice. generally a 600 is good for a mostly stock motor reving to 5500 rpm. a mildly modded motor with juice likes a 650 dp. when you mod a motor alot and factor in the high rpm range in which you plan on reving then the 700 comes into play. vac. will not tell you what carb makes more power. and the math theory will only give you a carb guideline for a stock motor. if you are lucky enough to have some friends who use carbs, convince them to go to the track with you and try their carbs. when you find a carb that seems to be best you will know what is good for you.
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