Not a Shelby, but it's a vintage photo, and I like it.
It's Erwin Sommerhalder's Maserati at the 1959 Mitholz-Kandersteg hill climb.
There is actually a Shelby connection though, as Shelby raced a Birdcage and said this:
"The best handling car I've ever driven. Easy to go fast, to corner, and does not seem to be working hard at top speed."
Cheers,
Glen