I'm not going to use the open chamber heads,I would have to use pop up pistons to get the CR I need.I'll look into getting the stock heads re-worked with hardened seats when I do the total rebuild on the motor.For now I'm just going to leave it as is.I want to get all my ducks in a row before I start the major motor work to eliminate down time.I have lots of sheet metal work to do also.I need to make some extra $$$ before I start anything I can't finish.I wish I kept all my old hot rod stuff I thought I would never use.LOL