Besides checking the floorpan under the mats for rust, check the heater tubes that run under the bottom of the doors. They tend to rot out also. Both engines should have the "doghouse" coolers on the engine fan shroud. If they don't have the "doghouse" coolers on them, someone has changed out the engine.
I can't believe that a VW this old in Ohio is not rotted out from all the salt they use on the roads in the winter.
A un-rotted VW is rare even here in CA where it is dry and they do not use salt.