I was looking at going that route also until I found a 64 bed for my 66. I realize it would not be period correct, but it would be a nice alternative with modern taillights and tailgate. I was looking for a styleside, stepside, or the 92-96 stepside and just could not find anything in my price range until I found someone with a whole truck and he wanted to part it out as he needed the doors for his 65.
Mark