looking for a cheap way to hop up my 22r, i know the normal stuff, carb, intake, exhaust and all that, My main question is with 20r head swap, any clue how much poer it would add and is there anything i should have done to it, like something at the machine shop or . . . .? also if i do the head swap will a 22r valve cover still work? and can i use the same carb i have now? i saw a video saying i need some kind of adapter?