As Paul stated there were many 1 year only parts on 1974 Camaros. Trying to find them was/is tough even in the few years after the '74 model year. My car actually had a few parts, grille and header replaced by the original owner because of a fender bender. That was sometime around 1976-77. They used what was on-hand at the dealership. I do know for a fact that it had the factory production parts when it rolled out of Norwood since the original owner gave me pictures of the car when it was a month old. It looked like this.
Red/white/blue Camaro emblem mounted in the center of the grille, nothing on the header. A lot of '74 Camaros have had the grilles replaced. If you couldn't find an exact '74 grille then you couldn't mount the emblem since only '74s had 2 round plastic mounting points molded into it. Some guys put the emblem on the header panel because they wanted one somewhere on the front. Chevrolet moved it to the header panel starting in 1975. The Nickey car is a pre-HEI ignition car since it was a November build. My car, also pre-HEI was actually built 489 cars before the Nickey.