I've got a 4.9 liter in-line 6 that runs great, with 123k miles on it. I've been using the body, a 93 f150 xlt, for mostly small odd parts and aesthetic parts, but motor and tranny is fine. What would it worth to sell it off just for motor?

Welcome to Automotive Forums!
It's worth whatever you can get for it, but off hand I'd say $500.