If the clutch cable is binding against the shift rod, then it is likely that the clutch tube has broken loose from the inside of the center tunnel. Dig out all of your flashlights and mirrors, and remove the inspection plates in the top of the tunnel. Try to get a look at the clutch tube while you press the pedal--it should not move at all, and I'm betting that it is.
For a cut-away (literally!!) view of what goes inside the tunnel, see:
http://www.pelicanparts.com/techarticles/9...nter_tunnel.htmRepair involves cutting open the tunnel and welding or clamping the tube into place again. Remember, you'll be welding right next to fuel lines and electrical cables and so on. Being very very careful and having fire extinguishers handy is the way to survive that.
--DD