Color for Radiator support & areas behind grille on 71 Scamp

I've seen this asked many times before, but many of the old posts don't have photos anymore, and those that do are mostly for Barracudas.

If you look at my avatar photo, you'll see my car is all purple. This is how it came factory. I never really noticed the color behind the grill much but then I've come across people insisting it's best to go black. So is it necessary on a 71 Scamp (dark color) to have the black out treatment? If so, what should be black? I can easily have the body shop paint it SEM hot rod black when the paint the rest of the car and graphics. I'm going to be using a shark tooth grille as well, where of course I did originally have the standard grille.

I agree it looks better from what I've seen on light color cars, but I'm not going to bother the painter with it, if it doesn't matter for dark color or for Dusters/Scamps style grille altogether.

Thanks