You could log the DC-6 time under multi-engine for starters, or four engine time if you have a heading for that. Nothing wrong with tailwheel time in the DC-3 either, some log it as special time for lack of a proper heading. I threw the DHC-7 time under four engine turbine, good machine for a lot of TMAAT questions; RNAV STOL LASO approaches, Cat II ILS's, legal taxiway departures from PHL. Heck I fly a piston twin now, I don't think anyone rally gives a hoot.