OK! I am a happy camper!
Left Side
Right Side
So this turned out to be more work than I expected (big surprise there). Cleaning up the heater boxes was the easy part.
The control tubes through the tunnel were clogged with gunk and rust, it was like drilling a relief well to get those clear. Pieces of the old cables were stuck inside. I ended up using a piece of stranded cable and I unraveled the end a bit to make a snake type device and then put the other end of the cable in my drill motor.
The reproduction 'accordion' type tubes between the chassis and the heater boxes didn't fit on the heater channel 'ports' on the chassis so I ended up repairing the originals for now until I figure out what is going on with the new ones.
BUT, I now have heat! and lots of it! I am most thrilled with that.
A big thanks to Dave for hooking me up with a useable set of heater boxes (I have your J Tubes)
I am ready for the rest of winter!