I purchased my copy in New York City in 1965.
As for reading it, yeah you should. It covers his career and I'm sure "as told to" author John Bentley executed some liberty with reality, particularly at this point in Shelby's career. But it does cover his whole racing experience up to 1965. Maybe best of all there's an index, so you can look up names, like John Wyer and Mrs. Carroll Shelby (at that time).