There are two other Racing Cobra books by Friedman.
Carroll Shelby's Racing Cobras, by Friedman and Christy
Shelby American Racing History , by Friedman
Both are unfortunately out of print... you can cruise the used book sites or watch for them on eBay
be careful with the 'Archives' book... it is out there under several different titles, with different covers, both hard cover and paperback... but, inside, it is all the same book.
Friedman, in his own words, did NOT like the 427 and, as such, took very little film of it back then.