Mickey, I was going to try and answer your question on the A/C parts too.
You say you asked a simple question, for an
accurate recreation. There is not a simple answer to your question, as has been answered above. There are too many potential 'gotchas' in going down that road. I am here to learn, and share my Ford knowledge when I think that it is applicable.
Like Dave said above, you most likely can't go wrong by using the 1967 Mustang 390 parts.
Don't get discouraged, we get pointed restoration questions at the shop all of the time. In the time allowed, we can offer limited basic advice. Mostly it is "use the search function on a growing list of forums".
A good source is:
www.concoursmustang.com forum. There you can find advanced, quality, Mustang restoration information and techniques. Many of the same guys are over there too. Key thing: don't copy what you see on one car. Mustangs came out of 3 factories, they all can have different practices, chalk marks, details, suppliers, etc.
Another suggestion, go to MCA events. Use your camera and take
lots of pictures, ask questions to the owners if they are willing to talk. Not all will be able to do a brain dump of quality information, at will.
SAAC is a great source, but so much of the archived information got lost a while back with the server crash. Lots of the guys use the search function to retrieve old information to answer new questions. It sucks, I know.