After 40 some odd years, a lot of stuff can happen to a car!! I doubt that a Gran Coupe would be a V02 two-tone car. They came standard with a vinyl roof, with the option of not having it. that being said, anything is possible!
So if it looks like it was black originally, would you keep it black, or go with the EV2 Orange you were thinking about? I think black with a tan interior would look great!! but that's just me.