383 build help one piece at a time

If you want to get into some serious quench, go with a replacement 68-70 383 HP Piston. Just slightly positive on deck height...if I remember correctly, a Felpro Composition gasket just barely makes it work with a closed chamber head. You might have to shave a few thousandths off the quench side of the piston...not a biggie.
The old saying goes, "If the pistons ain't hittin the heads, you're leaving power on the table"