The test mule for the engine was a green 1967 Mustang coupe which the dealership dubbed KR-8. Over the years, Tasca has been credited with handing Ford a blueprint for the 428 Cobra Jet and Ford ...

Ford was still selling strong numbers for the Mustang in 1969 ... at the upcoming change in politics when it released the 428 Cobra Jet engine, putting Carroll Shelby in the delicate situation ...