Where are all the running hot posts?

Good question.

I think right after I got it charged up is when I had my freeze plug issue that rapidly worsened.

So I think that's inconclusive.

I do remember driving it enough times to be happy the AC worked.

...and now I remember I didn't have the aftermarket temp gauge installed then either.

Another thing I'm recalling is that the radiator has been replaced.
It looks like a factory Mopar but doesn't have a part number on the tank.
I need to check to see how many rows a 73 318 AC car is supposed to have.