The first 350 prototype was designed by Franco Scaglione. This was heavily modified by Carrozzeria Touring who had to produce the design for series production. After 120 cars, the model was revised again by Touring into the 400 GT 2+2. Probably the most tell-tale difference between the 350 GT and 400 2+2 is the paired headlights, but the cars have a number of important differences that make the 4-seater almost entirely new.