I've been puttering in the evenings - mostly accessing the situation. Spoiler alert: It ain't good.
Pulled the motor:
Got it on the stand:
Stripped enough covers off to get a look inside. I put fresh oil in it and primed it with an electric drill, put a little oil in the spark plug holes and turned it over several times. Then performed a leak-down test. Sorry for the flash, but as you can see, the needles are pointed at each other - 20over80! For those that don't know, that's really, really bad. And that is one of the better cylinders.
I wouldn't expect 10% leakdown like a fresh motor at operating temperature, but I pretty bummed about 80% leakdown. It appears the rings are just as stuck as the valves were.
I'll need some time to regroup and figure out my next move.
CR