Scott,,,,, good comeback.
Avanti the link to that "Build an Authentic Cobra" web site is pretty good. As to engines it states that some later model street Cobras used a 429. Which I seriously doubt.
As usuall it's extremely difficult to find ANY site or two Cobraphiles to agree 100% on the finer points of these cars (all though engines are a BIG point)! They were, most of the time, just different enough from each other to cause a fair amount of confusion even among the "experts". Many of which frequent the Club here.
...personally, I get a kick out of discussing the finer points ad nauseum.