They both sound like parts trucks to me...., although one or both may be
restorable, but neither is complete....if I read your descriptions correctly.
If they were Chevrolets (I've never priced a GMC of any kind) I'd be looking
at maybe 1000-1500 for the pair.
You may do better piecing things out, but that get's tedious.
You may want to look at an "Old Car Buyers guide" and try to get a handle
on it. They list parts truck values, you can add a little here, take a
little off for better or worse points.
If the parts truck has a bed and running boards, you may want to do a
little swapping, complete trucks always seem like a better deal, then throw
in what's left of the other. Potential buyer see less work ahead of them
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959