Your 720 would have been spaced 126mm for a 6-speed cluster, and had Gran Compe centerpull brakes and 27" wheels. If you're planning on doing loaded touring you may well want more powerful brakes; Tektro makes several affordable dual-pivot models with various reaches so you could also convert it to 700C wheels as well. Later 720s had cantilever brakes and 700C wheels.

Your Deore XT derailleurs and crank are fine, but original equipment would have been Huret Duopar and Sugino AT cranks (50-45-28 "half-step + granny").