Aardvark Models used to do the Firebird III in resin. It was a very impressive kit. Don't know if they're still in business but I know the owner is on the forum; maybe he'll check in.
There have been some really big (1/6?) scale R/C cars. A 40ish Willys and a 50ish Jesse James Chevy. But, yeah, pickins are kinda slim in those scales.
My son started his Freshman year in college today. The proudest and worst day of my life. He's gonna do well but I HATE to see him leave. If you're so inclined, please keep him in your thoughts and prayers.