Nice truck. I wish I could find one that clean. As for my opinion, I don't think you asked for an opinion. Do as you wish with your little treasure and have fun with it. A repaint won't hurt anything and a little moderizing is always good in the safety department too. These trucks from this era were built for farmers and the service industry, there is no rear value difference between factory original or restored. I would love to find a clean short bed like that to drop my big block into, but it seems alot of people would have a heart attack if I did such a thing from reading some of the threads in this post. I do have a steering wheel like that in my 63 so that is a factory part, but the hubcaps aren't.
Have fun with it and make it your own truck,
Scott