PS: There's always this to consider too. A piece of history that even the most one-eyed Ford guys can't argue with...
Carroll Shelby wanted to go with Chevy right from the start. It was only when the GM heirarchy pulled the pin on involving the company in motorsport that Shelby was forced to go to Ford, and the rest, as they say, is history.
Carroll Shelby
So FM, you have what Shelby wanted and couldn't get.