Looks like I again answered my own question. Looks like a Comp Cam 12-432-8 will do it with a 230/236 and .510"/.520" at a 1.5 ratio. Also, Keith Black makes some 4.030" bore hyper. pistons that run a 10.5:1 ratio on stock 64cc heads. With a little mill and deck, which are needed anyway, that should get me closer to 11:1 which should generate decent power.