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Originally Posted by CobraEd
Within reason, you can make almost any carb work on an engine. Your problem was undoubtedly not the CFM (size) of the carb, but the jetting. The jetting is everything. I think the Boss 302 with old iron Cleveland heads came from the factory with a 750 or 780. Get the jetting right and it will be fine.
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Yes and they ran like pigs under 3000 rpm. CFM is very important. Too much cfm and the motor falls on its face at low and mid-range rpm. Too little cfm and the motor is choking and nosing over at higher rpm.
In this case, fairly mild engine for street use, lean to the smaller carb like the 670 cfm. You will have more low and mid-range along with better throttle response. And as CobraEd says, get the jetting right.
John