Motor home 727 in duster questions

Agreed, especially for a motorhome engine you should at least rering/bearing the engine but also check the taper/bore because these things do get beat. Swapping the tailshaft also lets you look at the internal state of the transmission which could also be beat. Just my thoughts.
My 440 had 30,000 miles on it and it was on the very edge of acceptable bore specs etc. While this is leaving the scope of the original question I think it's important to share.