What's it worth? 76 Chevy 1/2 ton LIKE NEW, 22,000 miles

[Old Chevy Lover]

A friend of mine's mom just passed away a few months back, and he is thinking of selling a truck that was her husband's. (not his dad). Anyhow, its a 1976 (or 77) Chevy 1/2 ton pickup, long bed, that is in practically brand new condition. It only has about 22,000 ORIGINAL miles on it, and has always been garage kept. (This is one of those vehicles that everyone always hears about happening to someone else). Absolutely no rust at all, anywhere. No dents, dings, scratches, or bodywork has ever been done to it. He asked me what it might be worth, but I have never came across anything in this new and original condition, so I really don't know what to tell him. What do you all think?