The numbers and letters are the stamping date and plant (Dec 17th in your case)
Should be painted with a low gloss black first. Then the exterior color is added and overspray allowed along the edge (not tapped off) and at the scoop opening
Did notice that the hood (under structure) appears to have been altered/cut/modified near the front of the scoop area
Don't follow the finish on this example
shown for the understructure only