Michael,
Have you checked :
http://forums.vintage-mustang.com/forums/ubbthreads.php
http://links.vintage-mustang.com/
Prices for these cars are going through the roof lately, so expect to pay at least $9,000+ for a basic "A" code coupe in need of work, or $10,000+ for a 67 "S" Code coupe...
Bill S.
PS: You mention the 67, buy why not the 68 Mustangs???????Since visually, they are 95% the same body style