I have a a 400ex and besides body mods all i have is k&n , a white bros slip on and a dyno jet kit and i was going to purchase a 440 kit that came with a 440 piston,top end gaskit kit and cylinder sleeve and a stage 2 hot cam 1.would this be all i needed to turn my bike into a 440. 2. would i want the 12.5:1 kit or the 11:1 kit? thanx for any answers.