Rare Spec 1 of 1 Model, Supercharged 5.0L V8, Only 5,945 Miles, Black on Black. Rare is an understatement when it comes to this GT350! Only 414 Ford Mustang Shelby GT350s were produced during the four-year production run, and 87 were made in 2014. 14 total convertibles were produced, and only two in black. Of those two, only one had the 624hp option – this is that car. In addition to the 624hp supercharger option, this car is powered by a 5.0-liter V8 engine and a 6-speed manual transmission. It also has the front and rear Wilwood brake upgrade, light bar, gold stitching, interior upgrade, factory-tinted windows, black brake calipers, side scoops, and door sill plates. All options were added at the Las Vegas Shelby American factory.