What a great truck that is! Not only is it a survivor but you have a personal connection to the truck...If it were mine I would suggest preserving it "as it" keep the patina and battle scars preserved with a clear coat and just focus on making it mechanically sound...bcs its only original once. You are very lucky indeed not many people can say they have a cool truck like that and say my "great grand-father owned it" and each scratch and dent tells a story. What ever you choose it will be a great project and welcome to the group!