Stop in for a cup of coffee

Probably a York or Tecumseh compressor. If so definitely aftermarket. Wards and Sears used to install a bunch of those. Those are cool retro pieces though.
Pretty good. The side tag
upload_2019-7-2_15-26-41.png

But on the other side.
upload_2019-7-2_15-28-20.png

and the evaporator-blower unit is a Frigette Strato V.
upload_2019-7-2_15-30-2.png upload_2019-7-2_15-31-28.png

Which means nothing to me at the moment.

Definately some custom bracket work. Maybe it went in when the engine changed color. ;)