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My understanding of a muscle car in the 1960's was a vehicle with a mid-size body complete with a power to weight ratio of 1 horse power to 10 pounds of weight. But another thing to consider was in the 1960's gross hp numbers were the norm unlike the net hp ratings introduced in the 1970's. So a 312 hp car engine produced now may have garnered a rating of 350 hp or more in the 1960's, but with a 3800 lb pound car would still not be technically a muscle car.
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