There were several printings of The Cobra Story in hard cover. The first edition costs more than later printings. The cover art changed in later printings and at least one printing has slip cover art and photos in color. I bought mine on eBay and got it autographed at one of the SAAC Vegas events.
The paperback version was also printed by Trident Press in their "Pocket Book Edition" in March of 1967 and renamed "The Carroll Shelby Story." I found mine at a Salvation Army Thrift Shop for 35 cents! (early '80s) I got it autographed, to increase its value.
While getting the paperback version autographed, Carroll remarked that the French version was the tough one to find, so...I filed that thought away for the future. I don't know about French hard cover editions, but the paperback version was printed by Marabout Service in 1966 and titled "Carroll Shelby Des Cobra Aux Ford Du Mans."
Once again, eBay was my source. Wow, while pulling out my hardback copy to check its edition (1st 1965) I found another copy of the French version!
It is a good read, but ends just as the Shelby Mustang production and racing is getting going. It has been a long time since I read it.
Probably worth a reread, but I do know the ending!
Good luck in your quest!
Fast Farmer