OK, jumped back on the truck this afternoon and made some more progress.
Blew the doors off, pulled the steering column, ripped out the complete interior - dash, harnesses, AC/heat ductwork box, all interior plastics, everything. I have to drill out the spot welds on the steering column support to put in the new style one, so the pad and the mount will come out next. Under the floor mat was some seriously wet insulation, which had attacked the floor in several spots. I'll be wire-wheeling it and painting the floor with POR-15. Right now it's just scraped a little bit and vacuumed out. Had a LOT of dirt packed in the door sill areas.
Core support out finally. Took the exhaust out, too. I was getting ready to fight the always-rusty flange between the head pipe and catalytic converter, but I banged on the exhaust a couple times with a hammer and the joint in the front of the converter just popped out. Still had to sawzall the tailpipe off to get it out of there, though.
That's it for now...
Those of you that like your rubber floor mats for use in wet/muddy conditions, you might want to peel yours up and check under it some time. Unlike carpet, once it gets wet under there, say from a leak in the windshield seal, cowl, heater core, cab clearance lights, etc...it has nowhere to go. It can't evaporate, so it just sits there and destroys the floor.
Richard