Hi I have 2 top ends. One of them is all stock and the other is ported and has a shaved head. I'm going install a +3 crank and send my stock cylinder to flotek to get ported. He recommended running the spacer that comes with the kit instead of messing with the head. Should I run the stock head or shaved one with the spacer and +3 crank. From what I'm thinking the spacer already makes it so the piston won't hit the head but close enough to have the same affect as a milled head.