Here's what I plan to do to the engine/ what's already been done/ and some info. This is a 750 sxi big pin motor, bored to 780. It is a fresh rebuild, maybe 2 hours on engine. Fresh bore and hone. It has minor cylinder porting, ported and bored out west coast exhaust Mani, new seals and gaskets everywhere, mariner head, dual stocker carb set 40's keihin. Stock flywheel, stock timing, only running 150 psi wtf?? Had it bored and rebuilt by a guy that was supposed to know what he was doing, hes been doing it for 30 years. Any who I'm planning on a billet ADA head with 24cc domes, boyeson reeds, aluminum flywheel, opening up the 650 west coast exhaust Mani to 50mm on the Mani and 50mm on the exhaust to match it, any suggestions? Also putting on a impros hooker, I'll talk to them about what pitch I'll go with, they are - after all - the impeller pros. Lol