Don't get too excited, the Maverick isn't the "Rare Find". It is parked beside a Boss 429 Mustang in Juarez, Mexico. I found the book, originally looking into the Dyno Don 69 Boss 429 Cougar story. Jerry Heasley's Rare Finds Dyno Don Cougar is Chapter 13. The Maverick is in Chapter 14 (page 67).
the 429Boss Cougar article was fantastic. I think this Heasly book is better than the "ford Only" version, but regardless, both are very interesting reads.