Just an update.
Without time right now, two Jeep shops in Austin don’t have time for at least 30 days.
A friend has a shop, and luckily they have 2 shop vehicles, both Jeeps with the JK. Head mechanic laughed, said now he knows the 3.8 big time.
They found an eBay lower manifold and will obviously be putting in the new manifold gaskets, so should be good after.
PO must have cranked down that ECT a and when I tried to get it off, it went sideways. All this probably needed to be pulled and redone, so it’ll be a blessing in disguise.