Well, I thought he was starting from scratch. I think he is looking for a little more. If so, then it is either more pulley, like the 62mm, or the 185 crank, intake manifolds, ?injectors?, certainly more fuel. If you ordered a go fast kit from Rob, and went with the 178, you won't gain much...If I understand what you are wanting to do. Certainly the intake, psk, I wouldn't use the spacers will all help as part of his kit.