If you look on page 9 of my resto thread, it shows how I used the coupler but shortened the shaft.
http://www.cuda-challenger.com/cc/index.php?topic=44869.120You'll have to be able to weld though to make the mount to bolt it to the dash, and weld the shorter shaft on the coupler end.
The coupler (rag-joint) can only be used with a small block. With my big block, I welded the shaft together, eliminating the rag joint.
The other post has some columns that should work.
CHARGER 77-78 Floor Shift; w/tilt wheel
CORDOBA 77-79 Floor Shift; w/tilt wheel
DODGE PASS. 77-78 Floor Shift; w/tilt wheel
MAGNUM 78-79 Floor Shift; w/tilt wheel
PLYMOUTH PASS. 77-78 Floor Shift; w/tilt wheel
Hollander Interchange #: 238-845
158385
If you need pinouts, I can draw a wiring diagram to make your GM tilt column work. Try to find one without the hi/low beam switch contained in the turn signal assembly.