Slawko cnc'd mine and Self Racing finished as they built the engine...You'll get into lots of custom stuff making everything work right(rocker geometry-spacer under valve covers-intake spacer,etc,etc)

Mine are 80hp better than my originals that was on a n/a combo and PSO setup is a true nitrous deal...Engine builder said we're leaving between 50-75hp on the table with all the nos tricks !!

Not sure it's worth the coin yet as I just got mine back and it looks like I have to redo the headers also !!