The pro charger will take 100-150 hp to turn. you will have to make 1100-1350 for 1000-1200 at the crank. IIRC you're limited to around 900hp win two .130 needle and seats. Bo Laws sell some larger N&S that discharge lower in the bowl to also help with aeration. Single needle and seat bowls won't cut it. There are a few different bowls available with dual N&S.