> Was a 351 Windsor used in the Hertz Shelby 350 Mustangs in 69-70? The Hertz Shelby Mustangs were '66 model year and used 289's. The '69-'70 Shelby Mustang GT-350's were 351W powered, though. Shelby had a 351C with 3 speed automatic installed in his personal small block Cobra. Dan Jones