text: One 1967 Fastback was updated to a GT500 equipped with a 427 FE GT40 racing engine producing , and was known as the "Super Snake" The car was capable of speeds over ; hitting  during a demonstration (by Shelby himself) of Goodyear's Thunderbolt tires. No cars other than the prototype were built due to limited interest. The car sold at Mecum's 2013 Indianapolis auction for $1.3 million.
  In 1967 Shelby American built 26 K-code Mustang Coupes to the FIA's Group 2 specification. This allowed the cars to race in the SCCA A-Sedan class and the Trans Am series. The 1967 Mustang notchback Group II sedan was Shelby American's competition model for 1967. The same rule that allowed the 1965 GT350 to compete in SCCA's B Production class - no rear seats - effectively kept the Shelby Mustangs out of the Trans-Am series.
  For 1968, the Cobra name was applied to both models, which were marketed as the Shelby Cobra GT350 and the Shelby Cobra GT 500. The solid lifter K-code engine was discontinued by Ford, so Shelby used the hydraulic lifter 230 hp 302. It produced 250 HP with the high rise intake but was not equipped with Shelby headers in order to make room for power steering. The early 1968 GT500 used the Shelby installed 428 Police Interceptor with a single four-barrel carburetor rated at 360 HP.
  1967 Shelby GT350 and 1968 Cobra GT350