valve cover leak can wait as you know since you already drive a mosquito fogger or two.-There is some evidence of maybe a valve cover gasket leak
-I plan to perform a cold compression check before firing the engine. This may or may not tell me if a head gasket is bad. Oil looks fine.
-No idea if the sunroof leaks but there is no sign of mildew in the car which I would expect if it does leak.
-Power seats work, drivers leather is... Not great.
-Windows work but they are slow.
as stated pressure testing the coolant system might be a more telling story and I am sure that coolant needs flushing.
sun roof doesn't need to be water tight, but the drains need to be clear so they can keep up what might slip past.. having been under a tree, i would check them with some string trimmer cord or the like.
Seat leather.. you can go really nice or pretty nice but cheap... lseat.com did it in my 80 and in the GFs 100... the 100 was 2 weeks ago and that stuff is way nicer than what i put in my 80 couple years back. so something to consider.
Window runners, cleaning window motor (brushes and stator, and cleaning window switch contacts...well the drivers window can be done in an hour or two and get you pretty good. for the rear doors you do not even need to remove the panel and that is about 20 mins for both. Teflon lube might be a good temp fix.