Reply to "Is it possible this thing works?"

You're referring to the Hot Rod magazine article where some parts swapping and early dyno testing was performed.

I don't know if the one in the Hot Rod Magazine article was the only one ever cast, or if several were cast, but there is an SK/XE parts collector who owns one. I don't know exactly who it is, but I've seen him mentioned on the 'net.

Its looks like a dual plane manifold to me in the Hot Rod Magazine article, but according to what I've read it was actually a single plane manifold with the rear end kicked up higher than normal.

According to Ford the dual plane Shelby manifold with a 1050 cfm Holley Dominator worked better, made more horsepower, than the dual carb manifold, which would explain why the dual carb manifold didn't make it into production.

-G