Missed a bunch of updates!
Looking good!
Even though they're meaningless, I geeked out over all the paint marks and stampings I found on my 65 Mustang too. I found A LOT of them. Unfortunately, I did paint over pretty much all of them, rust free is more important to me than a paint mark. I did take pics of everything I found though
My C10 was such a spray painted up mixed bag of parts when I got it 22 years ago, I found jack squat of anything "original" EXCEPT for the model number in chalk in huge numbers on the rear frame cross member. It was almost 10+ years before I even knew it was there!