So, what I'm getting from this is probably aim for an extended cab or long bed '73-75 D100/D200 pickup to get the lack-of smog, front disc brakes, a good rear end? Maybe a '75 W100/W200 or a '74-75 Ramcharger.

All of my information on the Ramcharger I listed were from kbb or wikipedia so who knows how accurate it is?