If that old 1-ton is as straight on the other side as the profile photo, I would not restore the body. Some folks put a coat of clear over the rust to stop it and preserve the petina. They are only original once. You might have to use some rust converter first. Guys who do this would know.

1951 3800 1-ton
"Earning its keep from the get-go"
In the DITY Gallery
1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.