The particular division of GM that made these was called Packard Electric Division or P.E.D. P.E.D. was then folded into Delphi which was subsequently sold off from GM a couple years ago.
The TCC connector is basically the same as the IAC connector but the terminals are 'keyed' to fit only certain female counterparts. A couple sources for the connector your hunting would be Howell Engine Developments or Casper Electronics.
We test the IACV's in the lab next to mine, they should have the pins at least so I can make a plug in harness even if I don't find the right exact shell.
I was thinking it was something rather standard. Great!