I believe that the air cleaner is the same for 72 and 73. Here is a pic of the air cleaner on my 72 Q Code. Aas you can see it has the chrome (actually silver) top. Hope this helps.
As for vacuum lines, there is one for the snorkle flap (you can see it in the picture) and one on the driver's side that attaches to the auxilliary air inlet valve on the cleaner and the intake manifold vacuum tree.
Steve
http://chezdajez.mypicgallery.com/stevesmach1/351cj-air-cleaner.jpg
351C 4V Q Code
http://chezdajez.mypicgallery.com/stevesmach1/trunknmustangs.jpg
72 Mach 1 Q Code, 71 Mach 1 M Code, 97 F-150