It is a little surprising, given the car's present-day popularity, that there are no books dedicated solely to the 427 Cobra (that I'm aware of). Most are going to have a few chapters if you're lucky. FWIW, here is a list I've previously "published" on this forum of the Cobra books of which I'm aware, along with a couple of links to sellers who might have copies in stock of the ones that are no longer in print:
-Essential AC Cobra, by Rinsey Mills
-Original AC Ace and Cobra, also by Rinsey Mills
-The SAAC World Registry, editions One and Two
-AC Cobra 1962-69, a Brooklands book compiling old road tests and magazine articles
-AC Cobra Gold Portfolio, another Brooklands compilation
-Cobra, the Complete Story, by Brian Laban
-Automobile Quarterly vol 14-3, which has a Cobra article
-Automobile Quarterly vol 16-3, which has a Shelby article
-Automobile Quarterly vol 22-3, which has a great article on the 427 cars
-Carroll Shelby's Racing Cobra, by Friedman and Christy
-The Cobra Story, by Carroll Shelby
-Ford Cobra Guide, by Bill Carroll
-Road and Track on Cobra, Shelby, and Ford GT40, another Brooklands compilation
-Shelby American Guide, by Rick Kopec
-Shelby's Wildlife, by Wallace Wyss
-Daytona Cobra Coupes, by Pete Brock et al.
-Cobra: The Real Thing, by Trevor Legate
-Shelby Cobra, by Dave Friedman
-Remembering the Shelby Years, by Dave Friedman
-The Cobra-Ferrari Wars, by Mike Shoen
-Cobra Super Profile, by Grainger
-Cobra, by Beki Adam
-Classic AC's, by John McLellan
-AC Heritage, by Simon Taylor
-Shelby, by Steve Statham
-AC (Cobra) Autohistory, by F. W. McComb
-Shelby Buyer's Guide, by John Lamm
Many of these are long out of print; the best source I've found for them is found at http:
www.abebooks.com/home/TEW/
The in-print ones can usually be found at
www.motorbooks.com or
www.ewa1.com.
This list is almost certainly incomplete; for instance it does not include the latest Rinsey Mills Cobra book, which was just published this year.
Of all of them, Automobile Quarterly 22-3 has probably the most comprehensive article dedicated to the 427 and S/C cars; it is around 12 - 15 pages and has a lot of nice color shots. The Mills "Original" book also has as much 427 coverage as any, but you've already got that one. The Wyss "Shelby's Wildlife" book has a lot of 427 information. It was written back in the mid-70's and is tough to find now, but it makes for entertaining reading either way and I would recommend buying a copy if you can locate one--
Bob