[Nedsel]

Those numbers are close enough. Factory records suggest the first few 33xx cars came with 428's, and then the swap to the 427 side-oiler was made.

As for the often-quoted phrase that "Shelby American built 356 427 Cobras," a check of the breakdown at the top of the originality forum will show that there were fewer than 315 made, with allowances for whether or not one considers a bare chassis a Cobra.