Any dark color is a good contrast for white guts, Even Orange looks great with it.
Darker colors make it more work to keep clean and dust free ( if that is even possible)
Starlight Black ( code 19) was more than likely put on every year Firebird Formula in the second generation, even if it was special ordered for the years it was "not available".
Lots of colors "look Black" 90% of the time as well, but are Not black.