You have a nice Mustang to work on. We have two 1973 Mustangs (Mach 1 and Convertible), and love them both, in addition to two Shelby GT500s (1969 & 2020). You have definitely landed on a terrific forum, especially when it come to having fellow enthusiasts who who truly enjoy helping others with technical, diagnostic, and How To assistance. I look forward to seeing progress photos once in a while with your project.
Lynda (wife and Mustang/Shelby Chick) and i enjoy working on, and tinkering with, the pony cars, a lot. I have a channel in YouTube (Gilbert Hale) where we have posted quite a few videos showing different repair and diagnostic techniques on those First Generation Mustangs.
Following is a YouTube link for the deep restoration project for our 73 Mach 1:
And, here is that same Mach 1 on its last day of a 13 1/2 month long deep re$toration:
The attached photo is of all 4 pony cars. Not in the photo is our Honda Del Sol SI, which is in truly near perfect condition.