Not much unfortunately, and the REALLY sad part is probably not much more assembled either, it just seems not many people want "built" trucks.
Go in the 60/62 Classifieds and see what "built" trucks are going for verses clean originals with maintenance.
The problem is a 60/62 is not worth the sum of its parts. If it was in its "all new" condition and assembled but originally like that, you could get $30,000 all day, possibly even on Mud. But the fact that even though it's "molested" even in the best possible way, just slices the value ten-fold. It's the same reason I'll never sell mine, nor be able to. It's just too molested.
And it can't even be test driven.
I think you'll take WAY more of a hit them a gain.
There is one person who I can think of who would pay what it's worth.
@sschruff
Get it running. Drive it. Then see what you think.