The 1974 DeVille received a wide eggcrate with dual round headlamps mounted close together in square bezels. Rear fendersides were flatter without the elliptical bulge. The rear end had vertical bumper ends with the taillight built in.
The biggest news for the 1977 Camaro was the re-introduction of the Z/28. It was now its own separate model and not just an option. It was also the first year the Camaro outsold the Mustang for the first time ever!
The "Spirit of America" Nova was introduced in 1974 in anticipation of the US bicentennial in 1976. They were painted white and featured blue and red accent stripes as well as red and blue interior carpets and fabrics.
The 1954 Corvette, although not noticeably different, offered up small modifications throughout the year to improve upon the car. A few more color options were also added to the mix.