you'd have to ask him about his truck, he said it was an 'untouched survivor' that had no paint on the frame, you contradicted him, I simply pointed out you were shooting from the lip
I'll still ask you: what percentage of the one and a quarter million trucks produced in the TF years, at 11 different plants [+ one in Canada] have you examined close enough to distinguish between black paint and black phosphate? how many of each year and from how many different plants? nobody will accept your personal experience as proof of anything with respect to what was standard practice for Chev truck production - Tim has pointed to some documentation concerning GMC, you are providing nothing beyond opinion based on personal experience
Bill