Another example of good 1960s American styling was the Ford Galaxie, redesigned for the 1965 model year. The Wikipedia entry for Galaxies is here (scroll down for 1965 models) and a Consumer Guide take on it is here.
Like the Grand Prix, the Galaxie had a trim, taut look: no visual flabbiness. Also like the Grand Prix, its quad headlights were stacked and set in angular, "frenched" housings. I never liked cars with four headlights, but they looked their best on the Galaxie and Grand Prix.