From an old post of mine.................................
http://forums.pelicanparts.com/showthread.php?threadid=248432&perpage=20&highlight=ford%20gt40&pagenumber=5
This weekend I toured the Henry Ford (Greenfield Village Museum) and did the Ford Rouge Plant tour (F-150 assembly). While there I picked up this GT-40 book for $24.00, have the last paperback from the store.
I don't know if this is the best book out there, but in my opinion its a very good book at a great price (value).