At least there are a couple of reasonably priced piston options now to get decent compression, quench, and valve to piston clearance.
KB 162 flat top, KB 400 6cc dome.
The KB 400 works well with the 84cc edelbrock, sidewinder, stealth type heads.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads