Clean it with super clean. Spray and rinse well. even removes some old paint. Try rally wheel paint or bright aluminum . Rattle can from autozone. trim paint. The molded 70 silver grilles still get painted same as the black grilles. Just paint the same area as the 71 grilles the surrounds. If the gray is yellowed you may have to paint the whole grille. before super clean we blast them with baking soda. . Its like staring with a fresh grille unpainted.
You forgot to paint your headlight rims which are not from a GTS or GT. They are painted like a Swinger or Dart custom. Just thought I would let you know. I did the same thing years ago. I had a swinger on the right and a GT on the left. A purest caught it back then. so I changed it. just those six cross sections on each rim need to be blacked out.
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