I'm Cummins swapping a '74 Duster, thought I'd share the progress.

diymirage said

You know, if you are hellbent on seeing this through, putting a duster body on the frame of a diesel vehicle would be the safer way to do it

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This isn't a bad idea, AND it would be a hell of a lot less work, find a diesal 94ish reg cab Ram truck preferably 2wdr, shorten the frame as needed and everything power train wise bolts right up, fit the body and voila! You have essentially what you want for a reasonable investment. Worth a think