Finished the top end replacement two weeks ago. Family has been using the Jeep for short trips around town. Results so far look like the warped head was the issue. No overheating, coolant pressure feels like it is really 18# now and not 60, fans cycle when appropriate, and it even idles smoother now as well. Oil analysis wasn't particularly helpful since the oil wasn't run for long enough to determine break down of additives and accumulation of other compounds. It did come back negative for coolant though and they suggested I send another sample in after accumulating a few thousand miles.

Now if I can figure out the clunking suspension in my other '99, I'll be sitting pretty.