I have a non-hemi predator 212 and I'm looking for some upgrade advice. I have a 22mm Mikuni carb along with the curved intake manifold and angled air filter, racing spark plug, 18lb valve springs, billet flywheel, superbox exhaust(without muffler), stock cam, and stock rod. With this set up, what length arc rod and what cam should I get and what size main jet do you recommend? Keep in mind that I will not be upgrading from the dished piston to the flat top. Also, if I were to use a gx160 head, what size arc rod would you suggest? The engine will be going on a baja warrior