It is flat on the front, has no raised sections, and has nowhere for the headlight bezel to connect............why I am thinking not a Polara grill?? I don't know though.
Yeah those pics are better than what I saw yesterday. I think it’s a grille looking at the mounting flanges. Check closely for a Pentastar or part number stampeding into the flange. It’s definitely early 60s as that was the style.