When you had it apart did you notice if it has been collapsed any? If it is the correct column you can always slide it back out and make it work correctly. I've seen guys that stand them up on the end of the shaft when moving them around. If the column isn't tight they will shorten up. Is it possible it was an earlier A body column (pre 66)???
Just remembered when I put the column in the 69 Dart it was a little short also. I had the plate at the bottom of the firewall too far down the column which made the shaft seem too short. I couldn't figure out what was wrong until I noticed the steering wheel was too far away from the dash.