Yadaa!, Yadaa!, Yadaa! If shelby had his first choice for a big 3 auto company to tie-in with. We would be calling most people who put Ford engines into Cobra's;
Traitors! 
Chebbie motors would have been the norm. Not Blue Ovals. I keep my AC as close as possible to the original CSX3116 I grew up in. Put what ever you want into your cobra kit/replica. Because what you will never understand about original CSX (sb,BB) performance!
Won't hurt you!
Except in your wallet!
When you wish to sell your kit with a just motor in it.
Instead of a
Engine! 