I thought that was rather odd, the speedo thing. WONDERFUL pictures and a nice reference point for the street cars. I saved ALL those pics!
As usuall, Shelby was ahead of his time using 428's in a 427 Cobra. What a guy! In the years that followed that, and today, theres no telling WHAT engine you might find under WHAT hood.
Yup, Shelby set the trend in that regard.
I suspect the car is NOT "spot on" to accuracy but sure appears to be "very" correct. For instance, I wonder if the original overflow (radiator) tank was blue, not black, as it is now.