The value of any of our old Fords is going down steadily due to the fact that most younger people have little interest in them. I don't see the "bottom line of resale value" having much to do with the decision as whether to rebuild or not. Our cars are money losers. We have them because we like or love them for what they are. They are not an investment.
I just recently heard of a REAL nice 34 3w that sold for 22k locally. I saw pictures of it. All stock, nice interior, perfect chrome including grille, correct 21 stud engine.