I own a '65 fastback and have had a ton of fun with it at the track and on the street. Of course I do not have a Cobra.
Floors, cowl, inside the doors, trunk area and area below the side vents need to be checked. Fastbacks are getting tough to find.
Go here:
www.historicmustang.com and if you have any specific questions I will be more than glad to help.
Henry