Street 340 heads/cam recommendation?

Still running one(had 2). 70 340, factory piston out of the hole .17.
X or J heads, 2.02, purple stripe cam. 650 or 750, vac carb, didn't make a difference. Very good chebby camero 350, chebby chevelle 396 375hp, 383 cuda killer, with 3.23 gear.
But I think you have to go aftermarket pistons, as according to Dodge, I snagged the last factory 70 340 piston from a dealership in Penn.