Thank ya sir.
Well, I found the squeak in the passenger door. The bracket that attaches the window channel to the post on the inside of the door was the culprit. It only had 1 screw attaching it and the piece of sponge the factory put there to cushion the 2 pieces of metal was so deteriorated, it might as well not have been there. Drilled out the bracket to add a 2nd screw and replaced the sponge with a small strip of weatherstripping. Viola! No more squeak!
Changed the oil today and other than being old, it looked pretty good. Not milky or anything, just dark. But the oil filter ($@&?£%¥#€!!). Man!!! If that 800 lb gorilla that used to put the oil filters on at the Dodge Charger plant doesn't work there anymore, the guy that used to own my Roadrunner has him as a pet now. Also, with the power steering, headers, lower radiator hose, and a pulley right there, getting the old filter out and the new one back in was a chore and took some maneuvering to do so. But that's also done.
The correct heater core came in today. Now I need to follow up to see where the classic car shop guy is on getting that A/C kit for me.