Kevin,
To remove the distributor, it should just be two bolts - the two that go through the plate. I like to put my engine on No. 1 TDC and take a picture of the rotor position before I pull it, so I don't accidentally re-install it 180 out.
After you get that sorted out, I would give it a full tuneup:
https://www.packardclub.org/tuneup/1954tuneup-8cyl-1a.JPG Vacuum: should be 15-18" at idle and steady. Maybe slightly different for your engine. I have an old motors manual (i.e. Chiltons) from the 1940s that I got online. It has a whole section on diagnosing engine condition based on vacuum readings. Hook to any port on the manifold - does your car have a port on the intake manifold for the windshield wipers? It would be going down to the vacuum pump. I got my gauge from OTC via Amazon. I like it because it has a case; any parts store should have one.
Gauges I'll let someone else weigh in - maybe Howard (HH56)? As far as the thermostat, I would run a 170 degree thermostat.
Good luck!
Edit: Lots of good, simple info at packardclub.org when you click on tech info and tech tips.
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