As stated the 2266 piston is terrible. They will be at least.060 -.080 in the hole. With an iron open chamber head thats a bad combo. No compression no quench. It'll run but it won't be efficient. You should try to get a piston with a 2.060- 2.065 compression hgt. Get your short block together then pic your cam. Do it right or you may pay later. Ask me how I know..