This weekend I came across a magazine on the rack:
HOT ROD Archive Series #4
MUSCLECARS
Fall 2006
It has a picture of a GT350 on the cover and "26 pages of Shelby Mustangs and Pony Cars". "200+ Vintage Photos".
It also has a lot of stuff on the other brands, too. I highly recommend it as a "musclecar era in a nutshell". Some neat Shelby production photos, Hipos and GT350's being abused on the test track, etc.
Lyle