There were Mustangs and then there were Mustangs. Ford wanted its new little Pony Car to appeal to the masses and in executing that plan the Mustang could be had in anything from a plain-Jane version with an economical 6-cylinder engine (often referred to as a secretarys car) all the way up to the sporty GT models with optional 271-hp V-8s.Unfortunately although road-going Mustangs were considered sporty they were not officially sports cars at least according to the Sports Car Club of America (SCCA). And Lee Iacocca knew that on-track performance led to showroom performance so he needed to go racing.Enter Carroll Shelby. Shelby worked with the SCCA to modify the Mustang to meet the SCCAs requirements and enter the racing arena. The result was the now-legendary Shelby Mustang