Ohh, so you mean the linkage off the column. Mine stuck occasionally until I sprayed the crap out of it with WD-40 (no kidding) now it's so smooth it falls out of gear sometimes when I'm in 3rd.
I would probably pull linkage bar off, it's not hard, and weld missing metal to it if that's the problem. If the little house shaped (from what I remember) part is the problem you can weld on them too then grind them down smooth. A quick and easy fix might be to use JB Weld until youre able to get to welding on them.
I see youre in San Antone! I get down to the FT worth area every once in a while for family. I went to SA a few years ago for the riverwalk and Seaworld/Schlitterbahn (sp) and it was a big hit with the family.
Edited to add: I wouldnt go to a floor shifter if it wasn't standard for that year. You might fix the problem, but you'll hurt resale value when you put it up for sale since they wont know if you did it right and a transmission is kinda important. I guess you could do a build post here and point the new owner to it though to let them see how you fixed it. Thats what I plan to do if I ever have to sell Cecilia (after selling all my kids and both arms).