Pleeeaassseeee! 95% of all the Hot Rods, Custom cars, Race Cars, etc. are made up numerous non- factory parts. "Kit Cars" are mostly non-factory parts including the cobra replica market. It's all how you look at it, I know people that have a 1932 Ford Hot Rod...and there is not one 1932 ford part in it and they say, "it's a real 32 Ford".
On the other hand, Cobra's are replicas of an English sports car with typically a Ford motor in it...cuz Shelby didn't get a chevy motor deal from GM.
To stay with tridition...go Ford, but who really cares what the power is..what about the guy with the Viper in his cobra.
It's all good !
Bill