Ford Fairlane Thunderbolt
The Ford Fairlane was not the first car to come to mind when it comes to a muscle car. But in 1964 Ford released a factory-built drag racer. The Fairlane Thunderbolt had an aggressive design built for the track. The 427 V8 FE came with more than enough horsepower to motivate the car with authority (via Hemmings).
The rest of the design of the Fairlane Thunderbolt was bland. The 425 HP was impressive but not as impressive as other offerings from GM and Chrysler. The Fairlane Thunderbolt did not become a well-known muscle car in the industry as a result.