My pump is cylindrical so it's a 400. I think I found the problem. The plastic piece in the fuel shut off valve was very restricted. One side of it was drilled to the same diameter as the hole in the barbed nipple and the other side looked like it had not been drilled at all. It had a slit cut in it. I'm very surprised that the fuel was able to make it to the engine. Now I can see why my voltage was high at full throttle.I drilled it out and now I can blow through it with no restriction. I'll run it again tomorrow to see what I get. I'm sure I'll achieve full rpms now.
Steve