Cracker wrote: "I could be wrong but I think most of the 427 MR engines came with a Shelby "Sidewinder" intake. It features a single carb offset flange that is easy to identify. These are getting fairly rare now days - at least for nice ones and are worth quite a bit."
Grumpy wrote: "The SC cars left on transporters w/ 1x4's.... NOT A CAR SHIPPED TO A SHELBY DEALER WENT w/ 2X4 setups! There is supporting paper work to prove just that."
& Byots wrote: "The vast majority of street cars did not come with MR engines until 3300 cars, and these MR engines supposedly all came with 1x4 sidewinder intakes (there were a couple of C6 P/N sidewinders, along with C7's). The aluminum 1x4 MR intake BB describes may have come on a handful of cars that didn't fit the standard "mold" described above, but it was not a common part........"
SCX 427 wrote: "Sidewinder was a 67 part so was never delivered on a 65 Cobra. The 427 S/C and Comp Cars were delivered with a single 4 straight up medium riser manifold that was made of Magnesium. The aluminum was used as a replacement and supplement since you could not use anti-freeze in Magnesium. "
At least in part I'm starting to think I did know something but just not in the right order. I feel vindicated!
2/3 of the experts loosely agree on the historical findings - as of now. Good thread!