Watched a special on TV about the design and construction of it.
Shelby had a slight hand in the design and gave his blessing to it before they built a running example. After it was built Ford hauled it to Texas for him to evaluate. After a run around a race track he was doing smokey doughnuts with it. All the while he had a big grin on his face. To who else would Ford trust a billion dollor, one of a kind car too?