I'm not an expert on this but here's something to compare to. I bought a '57 3800 on an online auction. It belonged to a wildlife refuge and only had 28000 miles. It has a grain bed, is in very good shape, needs a paint job and some sprucing up. I gave $3400 for it 2 years ago. That was before the economy went completely belly up. I would expect it to be a little lower now. If yours had a 9' stepside bed, I think they're rare so it might add some value. Just my thoughts, hope it helps.
