Aside from the 67-65 Mustang, 64/63 Comet, 65-63 Fairlane, 64-62 Impala and similar in that year range, its all gone to hell and always came back as something rebadged, unpractical, gas hog or underpowered, twisted and grotesque.
And I like the current "retro" Mustang as its a good attempt but just a bit too big following the 69-71 design.