Please be advised that aftermarket air conditioning systems (with compressor, freon, etc) can be installed in a Kaiser, Frazer or Willys product with a 226 engine (at least, that's the version I know about). It would have the 3 or 4 ducts under the dashboard like other dealer-installed A/C of the late 1950's (Ford comes to mind). KFOCI Club Member Dale Hammon has installed air conditioning this way on some cars and can probably give guidance on how to do it, rather than cutting up the rear package shelf.