Rob,
GM was the only OEM to use "Thermal Set Lacquers" in the 60"s 70's and early 80's. Ford and Chrysler used TSE's from the 40's on up to mid eighties.
Yes, matching a faded colour is a stretch. Compounding the entire vehicle will help but it can be done if you have a good painter with an eye for colour matching.
A complete paint is the easiest route.