Rick, Very nice. Looks to be a '69 Mach 1? Or painted to look that way.
Yes, the older Mustangs were a real treat to work on the engine with the high shock towers, especially changing plugs on the larger motors, some people actually cut panels or holes in the shock tower/inner fenders to easily access the plugs from the side.
Some people upgrade the suspension to the Mustang II type, which eliminates the shock towers and gives you more engine room clearance.
As for the electrical, Many of those years had problems with the TRACES on the back of the dash board melting. it cause a grounding problem and all the gauges, lights, etc... would go crazy (Found that problem on mine!). They were just thin strips of copper on a flexible membrane. I had to replace a couple of mine with just soldered a wire from one end to the other.
We are pretty avid mustang people. We have restored a 1971 Mach 1, 1972 Convertible, had many others thru the past 20 years. We still have 3 mustangs in the stable. 2003 Mach 1 (Mine), 2008 Warriors in Pink Special Edition V6 (hers) and an older 1976 Cobra II (some assembly required! LOL).
We go to Carlisle, PA in June for the ALL Ford Show every year.