ATM/Holley verses Carter 625 AFB

I have never dyno tested a Carter 750 AFB v 750 AVS, but the AFB always felt a bit stronger on the secondaries going by the butt-meter. The AVS had holes drilled in the sec discharge tubes; each side L & R, had different sizes & positions. Obviously very specific for the application. One can only guess what impact that would have if something in the engine was changed, like cam or intake manifold.