727 guru question...

That’s kind of a tough one. Sure, everything will fit over, but it doesn’t hurt to get near the same year of 727 from a HD application (Loadflite) to keep from dealing with different end play or lockup / non lock up variations. Better yet, get one out of a Motorhome. They usually have the short outputs and a 2 piece driveshaft.
But, something completely different and that you may not want to hear… if at all humanly possible, you’re better off to adapt over to a married transfer case and transmission. But that requires a different transmission output with the transfer case adapter, and a later model transfer case. There was enough wear and tear associated with the intermediate divorce drive shaft that Dodge saw fit to get away from it. What year is your truck and is it a 1/2 ton or a 3/4 or full ton?
74 power wagon dream truck...
74 3/4 ton...