355 with P1sc procharger and Holley 750 carb. Engine runs great, AFR looks good, WOT is unreal. Im not running Power valves in the carb for now. I did in the past and the cruise was much better, It runs a little on the rich side now at cruise with a slight burble sound from the exhaust. I have been told by some to not runs power valves in a blow through carb that they would not work under boost, I dont see how this could be true, I have asked alot of people but I cant get anyone to explain how PV,s work under boost pressure. I would like to install the pv,s back in the carb. All the other mods have been done to the carburetor and the fuel system, fuel cell, twin pumps, #10 AN line, fuel pressure and volume is not a problem.

 

For blow-thru carbs, you need to do a lot of reading/searching here.