Yeah, for those who choose cast pistons, I usually recommend the Sealed Power 318 Mopar pistons. Their pin height is 1.720, which is is exactly what engine builder Paul Carter says the original 350 pistons had.
I've read that most pontiac engines came with the pistons at least .020 in the hole. Some say .023 was the norm. Anyhow, even with 318 pistons, some will still have to come off the deck, in order to get close to zero deck height, unless the block has already had quite a bit removed from the deck.
The rod pin holes will have to be honed out, slightly, to fit the .984 Mopar pins. But the cheaper price of the pistons, plus less deck machining, should more than pay for any charge for honing the pin holes.
The valve reliefs are slightly different. But, the reliefs in 350 pistons are very small. And, '74-up 350 pistons had no reliefs at all. So, unless you're gonna use some really small chamber heads and/or a high lift cam, there should be no valve to piston clearance problem.
