What I have seen is happen is a result of original design.
The cowl vent is the opening that allows air through the kick panel vents. The cowl around the vent is a chamber that may have a 1 inch drain hold that goes down into the rocker panel. But leaves, sticks and other stuff can get if the cowl vent and not get through the 1 inch drain hole. It builds up and plugs the drain and leads to the sides and bottom of the vent chamber rusting through. Might rust to the inside, the outside or bottom. Take off the vent grill and feel around in the chamber and see what is in there. Be prepared for even mice. Vacuum out what trash may be present and inspect for what damage needs to be repaired. One of the first things I would do with any oof these cars as all have been sitting in who knows where for years collecting who knows what trash in the cowl area.
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