72 Jimmy front grille help

[GM man]

Have begun an "update" on my Jimmy, putting 6.0/4L60 and new interior, suspension, and maybe an entire paint job. But one thing I've always wanted to do since I've owned this thing (10 yrs) is to paint the grille with the correct black paint the way it's supposed to be from the factory. My question is what paint to use? Flat, semi-gloss, etc...? The other thing that gripes me is that I'm sure this grille is aftermarket, but it is noticeably kind of yellowish instead of real clean chrome. My headlight bezels, bumper, and surrounding chrome looks good, which makes the grille look worse. I guess I'm gonna have to find a place to get it re-chromed. I've tried several things to get rid of that yellowish color and nothing has worked. Anyone ever have that issue and will re-chroming work? Can't really see the discoloration of the grill in this pic, so I'll try to find another one...