Chevy Chevelle Grill Classic Car Chevrolet Front Used Vintage Year ?

Description

The first picture shows the front of the grill propped on a rock, for a better picture angle.
The last picture shows a yard stick across the top. from top screw hole on left to top screw hole on right is
approx. 39 inches.
I don't know what year this is, i could look at pictures and guess, but you probably know what year it is.
Local pickup only in Columbus NC 28722.