What Heads?!

Most good heads will not work with the piston... What is tha part number of them? They may need to be modified to fit in a closed chamber and to work with angled plugs... The Stage VI heads are junk out of the box... 440 Source Stealths might work as they are straight plug... Same with the "452" MP/Edelbrocks. What is your elevation? Do you ever bring the car to sea level?