In an effort to test the new head stud I put nearly 30 miles on the Jeep today. It's only 20 degrees out so perfect weather for an open air adventure. The new stud appears to be holding its own. No coolant leaks there or anywhere else around the head, which is a huge relief. I'll continue to keep an eye on it, of course, but it looks like I won't need to tear the motor apart, at least for now. I still need to change the oil and see if still turns to milk. I don't think it will.
I do have what appears to be a separate small leak in the radiator, right at the base of the filler neck. I thought originally it was a bad radiator cap but turns out it's more than that. Coolant bubbles out slowly but ends up blowing back all over the motor once it drips down near the fan. I may end up pulling the radiator out and taking it to the shop for a thorough once over. It is original to the vehicle and I haven't done anything with it aside from straighten out a few bent fins a paint it.
Once again, thanks for all the advice on that head stud. Another crisis averted. Anyone have any advice for full-body frost bite?