Based on the Belvedere, the GTX was the first Plymouth designed with performance as the first and foremost priority. It had just enough spark with a special grille and tail panel, simulated hood scoops, and a “pit stop” chrome gas cap to make anybody think twice about revving their engine next to it at a red light. Backing up its bark with plenty of bite, this GTX was ordered with the 440/four-barrel Super Commando engine package, rated at 375 horsepower, and a four-speed transmission. The very clean maroon bucket seat interior nicely complements the bright red paint finish and maintains the spartan performance theme with a 140-mph speedometer, AM radio, and console-mounted tachometer. Showing just over 84,000 miles, this car shows signs of an older restoration and will feel right at home at the Woodward Dream Cruise or any other muscle car venue.