If you go the whole pull the engine and trans route, you could end up with a long list of fun stuff to replace "while you are at it"
I would look at CB boots, the foam seal, clutch (at least check the condition), main seal, needle bearing in the crank, shifter bushings (now is the time to address any shifting issues).
I'm sure there are a ton more, but this wrenching party could turn into quite an event with a long list.