Very nice looking Mustang. We have two 73 Mustangs, a Mach 1 and a Convertible. The vert was barn stored over 40 years, and has about 21,000 original miles on it - and is in near perfect preserved condition. The Mach 1 was deeply restored ($$), and is in really near-perfect condition. I did some upgrades to both Mustangs I thought you may be interested in knowing more about. But, first, I note your Mustang originally had A/C, but the compressor is missing. Both of ours were originally non-A/C cars I added Classic Air A/C kits to, and I could not be happier for having done it. Classic Air also has a division that specializes in getting oem replacement A/C parts for folks preferring to heep their original parts in place where they can. Following are both of their web links:
https://www.classicautoair.com/
https://www.originalair.com/
We had ***** light instrument panels in both cars originally. Replaced both panels with Dakota VHX analog units.
https://www.google.com/search?q=dak...i60j69i61l2.4433j0j4&sourceid=chrome&ie=UTF-8
I replaced both radiators with three row aluminum radiators, along with an aluminum shroud with dual electric fans. I have some YouTube links showing how I did that, plus how I added a
Fan On LED light alert system. In the YouTube descriptions I provide parts lists and vendor links.
https://youtu.be/T5DrC2zrpIA
https://youtu.be/ErDOMJ1hOnA
I also added a Garmin Drive 72 GPS with optional backup camera unit.
I also installed a WebCam.
Of course, all that meant I had to upgrade my alternators, but you already have that covered.
And finally, I added full length ACP center console units, where I took out the center ash tray and installed a fabricated Power Panel with two 12 volt outlets, a dual USB outlet, and a digital voltmeter.
if any of the above projects we did interest you let me know and I will provide various files and links so you can see how we pulled it off. Meanwhile, here is a YouTube link to a walk-around video of the 73 Mach 1 on its last day or restoration:
https://youtu.be/_Fl0B-qmlLI
Attached are some photos of the vert.
Finally, in case you need info on the engine vacuum system routing, I have the 1973 emission control calibrations with the 351 4v calibrations missing in the shop manual inserted. That file is attached. If you need the electrical schematic (1973 is really an excellent manual) you can go to the following link for it and other manuals:
https://www.forelpublishing.com/clickbank/index.html
One other thing we did on the Mach 1 was replace its C4 auto tranny with an AOD 4 speed automatic tranny. I suspect you will keep yours as a 4 speed manual.
Have fun with it!