Lead based paint question

I'm watching an episode of Fantom Works and they were painting a gold 65 Valiant Barracuda. The painter lamented that the original paint was a lead based paint formula and matching it was difficult because of that. Any Mopar historians here know when that paint process ceased or if it was even ever used? I've never heard of it used in the automotive painting process. House paint yes. I've painted cars in lacquer, enamel, acrylic enamel and Imron but none of the newer products that seem so much better. Just curious.
Author: Tink