The Definition of "MuscleCar"

homecloned said

The first true muscle car was the Pontiac Tempest with the GTO package. 389 with tri power. The idea was to start putting the big motors of the full size cars into intermediate body styles.

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Why aren't Max Wedge cars considered the first Muscle Cars? Huge engine, multiple carbs, mid-size car, a real hood scoop, unlike that thing on the GTO, and the first ones came out in '62.