I've removed the tank, flushed it, sealed it, and put it back.
When I had the valve cover off I sprayed the valve springs with WD40 to be on the safe side, but I gotta say, she looked like a fresh motor when I pulled the valve cover.
When I was pulling the tank, and under the truck to loosen the bolts for the under seat tank, thats when I discovered the rot on the flywheel inspection pan.
I sprayed the crap out of it with WD40 and with some time and the help of a wire brush, I got it pretty clean, but the ring gear had a spot of "gnarled" teeth.
With the truck in neutral, I was able to crank the flywheel all the way around several times to inspect it, so i'm taking that as a sign that the engine is free... and you can feel it's got compression!
I did pull the plugs before hand and shot some WD down into the cylinders to help free 'em up.
You know, I pulled the truck home without having to so much as put air in the tires. This thing as been sitting for 20+ years, and the tires still had air.
Nebraska weather is dry.. it keeps these old beauties in pretty good shape. Even the stuff you see in the bone yard looks pretty good.