Here's another version of a heater that's in my rig...a "Mopar 70". Not sure if this is the one you have, Tom, but I'd guess chances are slim since there's no stainless on this box (if there's stainess on yours, it's probably polished). But it's an interesting unit that someone put in mine long ago because this California truck never came with a heater in the first place, as the firewall hasn't been punched out for one. (Maybe a new transplant from the midwest or east coast came out here and bought a truck, and didn't think he'd need a heater in CA...only to find out that it indeed gets cold in the winter!!!)
Anybody know what a Mopar 70 goes in? I got 2, and one is up for grabs right now if someone wants it.
I just got a truck master heater from Mr. Van Note through ebay and plan on putting that in, along with the fresh air kit aquired from Reg a few months back. All that's still needed are control cables and switches.