And each year grill works are year specific. Parts of them can be swapped around between 67 and 68, but it's best to sticke with each year grillworks as a set. 69stuff is kindof 69 specific.
For you it would probably be easiest to just remove the letters and fill the holes.
My car has one 68 and one 69 fender, a 67 nose with the lettering welded up, and a 68 grill works,and a 68 hood. The car is a 68 with 69 tailights and finish panel, and 67 back-ups. The dash is a 70. The front suspension is mostly 70/72/73 the rear end is a 69. The engine is a 71, with 69 rods.The tranny is probably a 68.There are lotsa parts I have no idea what year they are......Some parts are not even Mopar.