Opinions needed on 72 to 75 D100 or W100 Dodge Truck

I don't know to much about the older trucks, but I don't think there is much aftermarket support of the 70's dodge trucks. Those probably have drum brakes on all 4 corners, if its a 4wd truck its not as big of a deal to upgrade to discs, cause you could get modern axles with disc brakes and swap them in.
With the 2wd truck it would probably be easier to get a chassis from an 80's Ram and swap the 70's body onto it. More parts are still available for the 80's trucks compared to the 70's ones.