One of my neighbors had a '65 Mustang bar that he brought over because I had told him I was looking to put one in my bird. The bar was too short! Seems the engine compartment on the Falcon is a little wider than the Mustang.
Check out Total Control Products. They make a modular set-up that you can use all or part of in the Falcons. I'm using their shock tower supports only in my car and love them. Very nice looking and removable for quicker and easier spark plug changes, etc. An added plus is getting rid of those ugly factory sheet metal pieces. I have some some photos that show them in my garage section here if you care to see them or go to the website.