And more to my last post...
So it wasn't my alternator! But I have a new one anyway. The old one was 40 years old so it was bound to go out, right? (Everyone say yes please)
I also learned that an impact wrench does a wonderful job of removing the pulley nut. The new one had a single pulley so I had to stick my old one on.
So it's my dang water pump. I think the whining it made sort of reverberated back against the engine block. New pump arriving today.
In the meantime I learned how to adjust my exhaust valves thanks, in part, to a great video posted by someone on the 3B forum. It was quite easy. The hardest part was shoving the cover plate aside for clearance. The new valve clearance was too tight. It's perfect now. One other was needed adjustment and the other two were fine.
It's amazing how well this jeep is running now. I'm almost hesitant!