Cars like that are still out there. Get one cheap, rebuild it your way.
Dodge Charger and 67-668 Mustangs... two of my favorites.
There’s a scene in Bullitt, during the chase, where they blow past what appears to be a 68 Pontiac GTO as well, with the snorkel hood scoops. Also a white 68 Firebird in another scene.
So many badass cars were around back then.