I couldn't edit so I'm adding this. I should have clarified my car and assembly manual were 1971 specific. I don't know about 1972, which could be different.I haven’t looked at it in a long time and my resources are still packed from a recent move, but the emblem in my assembly manual was a one piece. Now here’s the trick, not all SS454 El Camino had the 454 on the tailgate. I restored an original one back in the 90s and it absolutely did not have one.
Since this was the first year with a small block and the 402 didn’t get them, there would have to be a coordination between the tailgates and cars with 454 only.