Motor home 727 in duster questions

Last two major pieces i needed was front brake conversion and rear axles for LBP, the axles got backordered at doctor diff but if i used SBP axles i would need new brake setups. Then i realized i also really should have frame connectors and torque boxes.
around this time my 78 Ford engine started rod knocking and it's a running driving vehicle so it has taken priority over the Duster.

Unfortunately OP is on the other side of the country otherwise i would let my BB 727 go for cheap.