To get the car so you can drive it, any shifter you can hook up the likage to will work - hell you can pull the shifter linkage by hand to get it into gear and drive it around (I have). Once the car is in drive, the ECM will take care of shifting it for you - unless you have it deleted from the program. I'm not 100% sure if the linkage will mate to the shifter you have, but it may be as easy as checking a parts-warehouse to get linkage that will
hook up to the 4L60E and the shifter you have.
I currently have a thread open here
and on the Chevelle site
trying to understand the TAPshift stuff that GM used on these cars to 'manually' shift them. Hopefully I can get it figured out and post a solution on how to do it.