Originality Preservation & Documentation

[c10ken]

Just need some experienced opinions: I'm the 2nd owner of my Father-in-Law's '66 C-10 shown here right after he bought it. I have the dealer receipt, SPID, Protect-O-Plate, Owner's Manual. It's original 292 has been rebuilt 3 times. 1 barrel carb been replaced a few times. So it's an "original 2 owner". Was my daily driver for many years but not anymore. It will stay in the garage. Any recommendations on how I can preserve it's originality? It's licensed and insured but only for occassional use and I'm working on freshening it up.