The Shelby Mustang is a higher performance variant of the Ford Mustang which was built by Shelby American from 1965 through 1967, and Shelby Automotive from 1968 through 1970. Following the introduction of the fifth generation Ford Mustang, the Shelby nameplate was revived in 2007 for new high performance versions of the Mustang.
The 1965–1966 cars were the smallest and lightest of the GT 350 models. These cars are often called “Cobras”, which was the Ford-powered AC-based two-seat sports car also produced by Shelby American during the same period. Both models use the Cobra emblem, similar paint scheme, and the optional “Cobra” valve covers on many GT350s that were part of a marketing tie-in by Shelby, as well as one of his iconic symbols. All 1965–66 cars featured the K-Code 271 hp (202 kW; 275 PS) 289 cu in (4.7 L), modified to produce 306 hp (228 kW; 310 PS). Marketing literature referred to this engine as the “Cobra hi-riser” due to its high-riser intake manifold. Beginning as a stock Mustang with a 4-speed manual, the cars were shipped to Shelby American, where they received the high-riser manifolds, had their stock Ford Falcon live rear axles replaced with heavy-duty Ford Galaxie rear axles, and were given larger, metallic-lined rear drum brakes and Kelsey-Hayes front disc brakes.
The 1965 and 1966 G.T. 350s were delivered from Ford’s San Jose assembly plant in body in white form for modification by Carroll Shelby’s operation, originally in Venice Beach and later at Los Angeles International Airport. San Jose cars carried an “R” in the Ford VIN denoting that facility. The only year that Shelby Mustangs from the 1960s came from another plant was 1968, where they came from New Jersey, “T” in the VIN, and were modified by A.O. Smith. (Read more on Wikipedia.org)