Pontiac's rare 1977 Can Am, inspired by the muscle car spirit of the Firebird Trans Am, featured enhanced performance with a unique appearance package but faced production challenges, resulting in only 1,377 units made. In contrast, a 1987 Buick GNX, a symbol of Buick's performance prowess, is up for auction with only 26 miles, showcasing its turbocharged engine and sleek design. On a different note, a 1968 Oldsmobile Delta 88 Custom Holiday Sedan, powered by a potent 455-cubic-inch Rocket V8 engine, is highlighted for its swank and performance capabilities within GM's lineup during that era.