My old '78 W150 has a pretty straight grill, but all of the black "trim" lines are in pretty rough shape, along with the dodge script script up front. What is best way to touch up these areas?

 

I’m doing this on my 79 grille. The black ring is actually recessed slightly, I don’t know if 78 is also. I put masking tape over it, use my thumb nail to press the tape tight into the lower recessed corner, mark that line with a pen and cut the tape with a small exacto knife. Then I’ll mask the rest of the grille and spray it.