If it needs chrome, it ain't mint. A good solid core would probably bring $100 to $200 depending. One with nice chrome will bring a lot more. Keep in mind, with the 5 separate teeth and the center bar, and the turn signal bezels, replating a '54 Chevy grille by a good chrome plater could be well over a grand, so chrome is a big deal. Posting pictures would help, too.
+ = Not mint, last I saw a mint (not needing chrome) grill was about 3 bills but alas that was a few years back...