And just so you know...
The only thing that makes a head a GT head are the valve springs. So, what the others are pointing out; that any of the heads used on a GT engine were also used on a 2bbl Galaxie wagon and other low performance applications.
GT engines came in the Fairlane and Mustang, so they were drilled for a 14-bolt exhaust flange pattern. Heads used in other applications used the 8-bolt drilling.
So, you could be looking at a C7AE-A head with 14-bolt flange and assume it came off a GT, but, as in my case in particular, it could have also come off an H-code (2bbl) 390 in a Fairlane. Again, the only difference being the valve springs.