I know the A12 board concluded the A12 cars ( a12 bee shown above ) were black , so maybe that's a lynch road plant thing as all my B-body cars have been St louis build cars and I don't remember any of them being black dipstick. the only Lynch road car I've ever owned was a 1970 Bee and that car had a long hard road before it got to me so all bets are off with that one.
I had a really nice underhood shot of an unrestored 69 roadrunner 383 but lost it on a computer crash last year. and I'm 99% sure it was orange.
But just like anything else with mopar Never say Never