Steve, I actually disagree with you, I think the 74's are just as cool as the 73's! I like the 74 nose and tail. The 75's are ok, I never cared for the parking lights in the grille, but I think the sour note for me on the 75's is that they signaled the beginning of the catalytic converter, massive drop in horsepower, and the end of the SD-455. But the 75's are still pretty cool.
I think the 73's always go for more money than 74's because they shared the 70-72 design, which was still attached to the 1970-earlier Musclecar Era. The 74's seem to get lumped into the 75-76 era because they shared similar design cues.
