Good question Brian. I ask the same question pertaining to the 1970 deuces. My car and another unrestored car did not have the yenko tuned decal anywhere. It possibly could have been that both cars are hurst cars,yet I dont beleive that the unrestored red deuce at the first reunion had the decals either. In fact my car did not have the Ys on the center caps of the wheels, just the magnum 500 decals. The horsepower rating on the aircleaner lid was also removed at time of conversion by a razor.We also discovered that the LT-1 decals on the hood are different also. The L slants both ways, with the hoodline, and against the hoodline.There must have been more than one supplier. It all seems insignificant, but these subtle differences between cars raises the question of correctness.