[Cobra #3170]

I had a good friend who was also a Cobra affectionado at the time and he attended the Times Grandprix at Riverside. He told me that the Essex Wire car entered both races, production and the CanAm. What really impressed everyone was that the car was pretty competitive in the CanAm race.
I suppose they could have swapped manifolds between races, but I don't know.

Was there ever a 427 car sold by Shelby American equipped with Webers?

My take, Webers look really cool, do they belong on an original 289 or it's replica, absolutely. Do Webers belong on an original 427 or it's replica, hell yes if you want to look cool, if you want authenticity or horsepower NO.

A single plane open plenum manifold will produce more horsepower than an I/R set up because of the volume available to it, at least at 58 mm Weber flow rates.