Are you shooting laquer? If you're shooting bc/cc you'll get a cross reference to the closest newer color. If you're shooting laquer, you'll probably need a mixing formula unless you are lucky enough to find an old timer who knows what you're talking about, and can mix it.
Being from Ia. I never heard that saying. Most of the Camaro owners I knew back then were mini skirted girls to long haired gear jammers. Most of the rednecks drove old pickups, with easy rider rifle racks. With green, or no teeth.
