early 273 pistons.

perfacar said
on the 2 bbl 273, the deck is to be, -.011 down. 57.3 chamber with . 020 gasket, comes up 9.5 cr. this is info mopar supplied to NHRA tech.

Those are minimum numbers. Typically .040 mill on the heads to achieve those numbers. Not sure on decks. If they measured flat and equal, I ran them as is. Not a Class racer, so I could choose what to do.