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Check for proper operation of the vacuum modulator and check the adjustment of the kickdown linkage.

I had them installed on M code heads in 2000 and they're still functional, and have a set of Q code heads at the machine shop now having them installed, along with valve guides and adjustable rocker studs. Neither machine shop had any concerns about the spacing or orientation.

It's good you shut down when you did, you likely saved the block. Exhaust valve recession is a real problem for engines that were not designed for no lead fuel. Even though some supposedly received induction hardening on the valve seats my experience has shown that the only solution is...

Probably two issues. I would pull the spark plugs, see what they look like and make sure the gaps are correct. After the engine is warmed up the colder temperature shouldn't have any affect, unless your choke was closing due to lack of heat to the thermostatic spring. More likely need to check...

You said that you regreased the pins brings up an interesting conundrum. The Ford Shop Manual says "Be sure the locating pins are free of oil, grease or dirt". I believe this may have come about due to the limited availability of high temperature grease suitable to withstand the temperatures...

Because the calipers on these cars are single piston the caliper has to float on the attaching pins to compensate for pad wear and to keep the calipers centered on rotor. My first suspect would be that the caliper is not moving freely on the pins.

Ball joints

Have you changed the condenser, yet? If not I would change it, and I would also get a spark checker and see if you're getting a spark after it dies. https://www.harborfreight.com/search?q=spark%20plug%20tester The coil is another possibility.

A loose connection can also cause a resistance and overheating. There are clamp on ammeters that are much smaller than the one you show, but will still not be all that easy to separate out the wire to measure them. When you said that the switch works on all settings I'm assuming the blower...

What step up springs are you running, and verify that the step up pistons move freely in their bores with no binding. Have you tired connecting a vacuum gauge to check what your vacuum is while driving at cruise?

Yes, as Steve said and showed, the small one is the correct one for temperature gauges, the opposite of oil pressure gauges.

The best gear set will not be quiet if not properly set up. I've used Richmond and NAPA gear sets with no problems.

Are you getting the correct sending unit for gauges? There are two sending units, one for turning on the idiot light when the engine gets hot, the other one for a temperature gauge. The idiot light sending unit will cause the gauge to go to full hot. Does the gauge register anything between cold...

What does the drive gear look like? It is brass and softer than the actuator gear.

Another economics 101, due to the compounding effect, a 3% inflation rate for 20 years means the prices will have doubled in 20 years. Not many people's income would also double, and certainly those on retirement/fixed income would not see their checks increase that much. A 3.3% inflation rate...

You can look in the AMA specs and it will give you spring sizes and spring rates, and ride heights measured from the bumpers https://7173mustangs.com/threads/1971-73-ama-documents.23433/

According to the wiring manual the fuse for the instrument/panel lights is #3. Make sure you have voltage on both contacts on that fuse when the headlights are turned on and the knob rotated to full brightness. Fuse 5 should be for the heater/a.c.

Post #11 in this thread has a chart that shows the dipstick lengths and will give you a starting point. I would verify the length using the method Basstrix recommended. https://7173mustangs.com/threads/interesting-video-about-cleveland-heads-oil-drain-back.44318/#post-447693

Did you check for voltage on both ends of the fuse (fuse #3)?

Yes, it likely will not be possible to dent them in without damaging the coating. I agree, looks like crap, and makes one think that whoever installed them didn't do their homework or know what they're doing. If that were my only choice I would cut the section out and weld in a curve around the...