You might see original color(s) at locations where exterior parts are bolted together (fender to cab, for example).
No, there is no way to know what options/accessories came with/on the truck, unless you have an itemized bill of sale (or, original order form).
That "vin" plate is most likely the
Vehicle Serial Number plate. The term "VIN" or "vin" was not used back then but it might have referred to the VSN or the ESN (Engine Serial Number).
