If I were to have 600+ hp in my 240z what would I have to do to the chasis to keep it from twisting? or is it fine stock? I am planning to get a 383 with a supercharger and the crat 383s I have found push 465hp out of the box with only 9.1:1 comp ratio. also with that amout of hp how wide of tires do you guys think I will need to hook up?