1965 Dart Crewcab daily driver

How about one of those specialty threaded inserts??

That is the correct answer, and what I will be doing if I resist the urge to butcher it. I am in project overload right now - the '73 Land Rover, the '73 MG, and the '91 RX7 are both engine-out right now, the '77 GMC is getting a new exhaust system... That leaves just the Dart and my slighty more modern Land Rover for daily driver status, so I don't want to tempt fate quite yet.