You will love that thing. You shouldnt have to shave the head anything if you got a coolhead with the domes. I am at 5280 feet, and run 91octane in my 20cc domes so you should be able to run that too. As far as the cluch goes, get a locker, you will just wreck your clutch and lose a bunch of power if you dont get a locker. You will need the locker its self, and then the cover to allow it to fit.