Would it not be nice to combine these unrestored trucks along with GM books and other GM literature, to go through all the numbers to see how things changed over the years. What was painted which colors or left bare. Why the part numbers change and what was the change. Although mine is slightly altered, although in no way original, I like to try and preserve the original content at the same time. The original black floors in the bed was something I came across as of late. How exactly are they painted is my present search. I was told they came with a protective wax paper that protected the finish during shipping and that the paper was caught between the wood and bed strips on the box sides.
Black was the factory color on the mirror heads in 63 yet all the NOS mirror heads I've come across are Cameo White.
Interesting tid bits like this help to evaluate the unmolested claim.