I have a 350 holley on a small roots blower on my pushrod inline four. (Not a hotrod as such, but here in New Zealand thats the best I can afford)
I've externally referenced the power valve, and have an ample fuel supply. (Holley blue) I currently have size 82 jets in it. I'm running a low vacuum powervalve, because my manifold comes on boost so responsively I don't want it too rich under part throttle load. BUT, it seems to lean out at WOT at around 6000. It just hits the wall. With my old carb it pulled effortlessly up 7500-8000.

What HG powervalves are you guys running on your (drawthrough) supercharged holleys?