Targeting the Olds W-30 4-4-2, Chevy SS454 Chevelle, and other max-perf Motown Muscle, the ’70 BUICK STAGE 1 SKYLARK & GSX catapulted Buick into the heat of the battle for Supercar supremacy. The ’70 BUICK STAGE 1 SKYLARK & GSX, in 360 horsepower trim, were the industry’s first “adult” Supercars. It was a powerful, high-quality, well-balanced midsize coupe (or convertible) with superb ride and handling qualities. While the GS-455 was almost invisible compared with competitive of...