With 200k, I would expect some blowby. Do a compression and/or a leak down test to see how your numbers compare to the factory specs.
Some oil in the air filter housing is normal.
You`ll need an air wrench to get that crank shaft nut off.
I remember was a PITA it was removing the bolts that hold down the oil cooler lines that cover the bolts that hold the bracket that supports the power steering pump and covers the front timing cover. Don`t think I am kidding. AND you can not remove the front timing cover without removing the oil pan as the oil pickup tube needs to be removed so the front cover can come out!
I figured the next time I would pull the whole motor and save a few hours of my time.