An F1 racer in Sports Prototype (i.e., sports car racing) clothing. No surprise as to its success. Enzo Ferrari was a sneaky bastard:
The Ferrari 312 P of 1971 through 1973, later known as the 312PB, was powered by the Forghieri [F1] engine which rested in an aluminum semi-monocoque, similar to the F1 car. In other words, it was basically a full body Formula One car.
