I have a .030 over 440 with Indy SR heads and a ported indy 2d intake and a 4150 quick fuel 1050 carb with annular boosters. A few months ago I converted a 3 circuit Dominator to a 2 circuit then bolted it to my 440 using an adapter. What a huge difference in throttle response with the Dominator! I wish I had the hood clearance to run the Dominator on the street and see how it really works. When I whack the throttle on the Dominator the engine acts like it wants to jump out of the engine compartment compared to the 4150 carb.