at the local machine shop that has a dyno, their 830 annular is the "dyno" carb. They put that on first to baseline every engine first, then install the customers carb (they have a "dyno" dominator carb also as needed). The 830 pretty much always makes more power than everyones "trick" 4150 carb and several have tried unsuccesfully to purchase it after seeing the HP loss once removed.
68 Cougar XR7 street and strip car, 428 4-speed, 3560# of fun, new best 10.43@131.2 1.47 60 ft
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