Isn't it the same in those years? I thought it was just grille, tail lights and emblems for about 3-4 years, up till the "new" 86 when they went back to their own styling on Pontiacs.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars