In 1970, Motor Trend magazine called this muscle car "the quickest American production car we've ever tested." What was the name of this unlikely muscle car hero?

The Buick GSX was an upgraded version of the Gran Sport 455 - an already established muscle car. With the GSX, however, Buick went one step forward. The GSX package added a performance suspension, front disc brakes, and cosmetic trim elements to the 350-hp 455 cu in V8-powered beast.

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