Tim! Those inspection marks, can it be for the under coating of the inner fender or the markings was for where the bolts for the K-frame goes into the frame? Great progress on your car.
My guess, and it is just a guess, that it is a inspector's mark for control arms bolt installed correctly and, or, ball joint cotter pins installed. less likely cottor pins. I have seen a few E and B bodies that had yellow paint on cotter pin location.