My '67 with a 396 has an open element air cleaner. On the lid, the decals were very faded and worn, but you could plainly see three decals on there. 1) the crossed flags 396 2) the semi circle 396-325 horsepower around the rim 3) a rectangle shaped decal that I can't read, it's maybe 2 inches by 3 inches. Any guess what this third decal should be? Should this be the "keep your GM car GM" decal or is it something else?