Not Ranked
The point about the primitive Lucas/Rochester fuel injection units in the 1960's is well taken, however, there were other conventional carburetors available to Shelby back then which could flow plenty of CFM, even more so in dual-quad configuration. Competition 427 Cobras ran a single Holley, as did L88 Corvettes. Shelby's guys still chose to run the Webers.
I can only speak from personal experience. I have never driven my car from where I live, Cape Cod--which is dead sea level--to a 6000 foot altitude. But I have driven to the White Mountains of New Hampshire and the Berkshires in Western Massachusetts on numerous occasions and never had a serious drop in performance. Granted, the disparity in altitude is more like 3000 feet, so higher destinations could require adjusting the setup. I would welcome the challenge.
Andrew, you will be thrilled with those Webers once you get them tuned up, especially if you're any kind of authenticity freak like me. Good luck and get ready for a real thrill ride.
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