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Always loved these types of sketches. Its neat to see what styling cues made it into production. I have seen a bunch of Len Casillo's drawings of the 73 Cutlass and they are very similar and just as cool!
I'm not a fan of the big rear fender "tub" on some of these, but you do get a flavor of the "crease" on the 1970-72 Cutlass rear fenders. The second gold one with the black top hints at the 67 Eldo roof.
The second illustration hints at the grille of the '68 Cutlass and I think those down-turned tail lights in the third one made their way onto full size Pontiacs in the late '60s.
I'm not a fan of the big rear fender "tub" on some of these, but you do get a flavor of the "crease" on the 1970-72 Cutlass rear fenders. The second gold one with the black top hints at the 67 Eldo roof.
You definitely have a good eye Joe... It is interesting, however, that some of the various design concepts do carry over from year to year or vehicle to vehicle, whether or not deliberate from a design standpoint or something that just unintentionally happened...