The madness of Mopar

Mine used to do that and it drove me nuts trying to figure it out, but I found it.
It was the connector in the wires from the distributor to the coil.
I cut the connector out, and soldered the wires and heat shrink tubing the solder joints.
Never had that problem again.
My issues were closer together than your though, as it would start and run fine all day long and no spark the next morning.
You can crimp that connector down a little to test this before you do anything to the wires.