175k sounds high, but I had a 98 ram with 230k on and it never had the engine apart and ran great. If it was me, I'd find a good set of heads, have them pressure tested and install... which is most likely the cheapest option.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram