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Those are still a little uneven, the racks may need adjustment, but I would run some good cleaner thru it first... that isn’t a switch, that is a battery level tester for the old style capped wet cells. Remove cap, insert into hole and if it can touch electrolyte it will light the led...

Sounds pretty even, and it doesn’t look like it was smoking up the shop too bad... did the exhaust flange temps change any?

The timing tolerance is +/- 0.2MM or .0074”, so probably not that much difference. yes, that is the correct valve clearance.

Well that right there is a genuine Caterpillar typo. That is a 6.6L 3116, note both labels have the same serial number... Yes, 65.39MM or 2.574” is the injector height/timing setting. So, your truck has the bracket that goes from the lower steering pump bolt to the side of the engine block...

That bare aluminum is the timing case, the cover is the thin yellow plate that is on the front... I think you pull the cam, or at least the cam gear to change out that case, and to pull the cam you need to pull all the rockers and pushrods up top. Could be they got things mixed up, or didn’t...

Did they replace the front plate or the whole timing case?

No, you don’t need any special tools for injector height/timing, just a vernier caliper with a depth probe like in this picture. In fact, you don’t need any special tools to do the whole process if you remove the intake plenum to expose the top of the cylinder head. Then a simple dial...

The problem with measuring where shown is you are seeing heat from 2 different cylinders at that point. You want to measure up near the edge of a flange like in this pic, right alongside the cylinder port so you are only mostly seeing the heat from just that one cylinder... start with the...

Does the primer bulb get firm when you pump it? If not, you are still inducing air someplace, the flapper bypass check is clogged/stuck open, or your pressure regulator has issues. Have you checked the primary fuel pressure? There is a T and a pipe plug on the forward side of the secondary...

As mentioned, conditioner and some fresh fuel... the fuel in mine looked OK, but smelled weird(storage additive, biobor ect). Only ran it on that long enough to load it, and refilled with fresh diesel at first opportunity...