need to raise compression w/o new pistons

OUTLAW said
He wants me to figure out a way to raise the compression as much as possible without replacing the pistons (doesn't want to re balance the motor again) My machinist is on vacation so I can't ask him about this.
What I need to know is, if we have the block zero decked and mill the heads to the safe maximum, does anyone know what we would end up with? Also what is the average cut needed on the block? What is the safe max cut on the heads? What is the stock cc on the heads (J heads)? I also figure on using a .029 head gasket and re camming as necccessary even possibly fly cut the pistons if need be.

Likely cheaper to buy new pistons and and have the rotating assembly balanced again then getting involved in decking the block. Certainly should be checked into before doing anything.