Looking for Info / Specs on Obsolete Mopar Piston

FWIW... I just ran a 274 advertised duration cam with 114LSA and 114 ICL and with a .051 head gasket (Felpro 8553 PT), came up with a DCR of 8.19. So that is getting where you need to go pretty easily. A thicker head gasket would be another item that you could interplay with intake closure angle to get the DCR you want.

You are not starting all that far off as the engine sits so it looks very doable IMHO.