I run a 830 Holley with a 750 Pro Form center, didn't get any gain with the center section, so I tried a 850 BG Silver claw, 1000 Race Demon and a 1050 Dominator, The Barry Grants ran about the same as the Holley, the Dominator took some work to run as good and was still lazy, I'm sticking with my Holley with the Pro Form, Much more consistant and just as fast.Every car wants something different...