As a daily driver, the Shelby 427 Cobra was a completely impractical street car. So much so they could barely give them away back in 1966 - 67. They were bought primarily by SCCA road racers. IIRC only about 550 of them were made. Now here's something else to stick in your hat. You only got a Ford 427 side oiler when you bought the race model of the Shelby 427 Cobra. The street models came with 428 CJ engines. IIRC only about 250 of them were built with the 427's.