Chuck,
The picture below is from a 65 GT350 but the hose routing is the same for 66 and 67. Depending on the year the PCV valve wil either be the hex base, non-threaded C5AE stamped valve shown in the picture or the round body C6AE stamped valve, possibly a C7 valve for later 67's. Sometime in late 66 Ford swithced to the round body PCV valves.
Dave
[Blocked Image: http://www.1965gt350mustang.com/images/5s114_06.jpg]