If your crank is trashed I did a HJR 4 mill crank, blaster pistons, stock cylinders, and FMF pipes and it was a good all purpose bike. No spacer plate I had a 2mm step cut into the domes on the head. Not an expensive build either I think it was less than $800 and half that was the crank. 4 mill crank and 66mm blaster pistons is 396 cc