In 1964, Ferrari tasked Mauro Forghieri and Mike Parkes with redesigning the 250 GTO's bodywork, resulting in what became known as the GTO '64 (or Series II). Three new cars were produced to the 1964 specification, and four earlier 250 GTOs were retrofitted to it by the factory. This redesign was intended to maintain the GTO's competitiveness for one more year, as the FIA decided to not approve the 250 LM for GT-class racing during the 1964 season. The Ferrari engineers incorporated many of the 250LM's aerodynamic features into the 1964 GTO. This resulted in a visual similarity between the two models, even though the GTO does not share the 250LM's mid engine rear wheel drive layout. The factory also made minor modifications to the engine, gearbox, chassis, suspension and interior. Despite these changes, the overall performance improvement was slight. The GTO '64 still saw some racing success with factory and privateer teams, including an overall win at Daytona in 1964 by Phil Hill and Pedro Rodriguez driving for NART.