Thanks guys! According to everything I've been reading on this topic, the annular boosters should offer a bit more throttle response than a down leg booster on the same size carb. While perhaps cutting down the CFM rating a little.
I'm in the middle of building a radical street motor (500+ cid) and a "Dominator" is just too close of a fit under the hood. They do make "down leg & annular" 4150 style carbs that flow up to 1050 cfm that do fit. I guess the annular boosters will help to make the motor a little more "streetable!"
