383 Build

I've got a 383 with the 906 heads going into my '72 Duster and I'm trying to get as much compression as I can out of it without using domed pistons. First question I have is this: I've heard you can 'zero' the deck relative to the pistons to up compression. can someone clarify?

What your asking actually, as I see it, is how much can the deck be milled. That itself I do not know. But, the pistons can be purchased in tall heights. With this in mind, you can get to or pretty close to a position of "Zero Deck " height. That is where the piston sits. Flush or zero with the deck.

Any material difference can be milled from the block, or piston if need be.

Also, does anyone know how much can be milled off the
stock heads to reduce the combustion chamber volume?

Sorry, I do not know that exact amopunt. I remember reading .060, but leave that to the actual build and machinest. Don't do it right away.