I ran those in a 340 for years with "J" heads and T/A heads. It was .016" out with a .039 Fel-Pro gasket, and the heads were milled at least .030". Unless the heads are severely milled the chamber has plenty of room for the piston being out of the block. If you're not confident, mock the engine up and put some clay on the flat "quench" area and turn it over then measure the clay. I think the minimum you'd want to see is about .045" with steel rods, .060" with aluminum IIRC, but there'll likely be more. The dome won't even come close to hitting that part of the chamber.

So no worries with a Mopar casting, but if you're running a different head all bets are off.....