You'll want to remember that there was an aluminum foundry for 'experimental' parts quite close to Gate 4 at The Rouge. When the CJ Mustangs first were released in '68, I was involved for a while with one of the Super 'E' Automatic cars. A couple of the guys who were involved with the Ford drag operation dropped off a Sidewinder intake to us one evening. There were no markings on it except the firing order on a runner at the front. It was somewhat simpler in design than other, later ones I saw. The manifold sat on the shelf at Corban for a year or so, and I finally used it in the build of the 427 I put in my '67 XR7GT Cougar.
KS