We did a bunch more pulls today trying different things. The "trick" carb is consistently down 50 hp regardless of what we do with it. We tried different jets, plugged the power valves, messed with air bleeds, etc. It just sounds bad and runs bad.

With the UltraHP Dominator back on there the motor cranked out 680 hp at 5800 rpm. Best torque was 637 at 4000 rpm.