help/advice 1980 dodge pickup drivetrain

1980 d150 pickup, slant six four speed. great body, no rust. engine is siezed. My buddy tells me that I can get an engine at the local pick-n-pull for $100. I also have a 318 poly sitting in my garage if I can find a bell housing and flywheel for it. My kid "borrowed" my camera so pics will come later.