When I rebuilt the steering column on my manual floor shift '70 'Cuda I installed one of these ER16 flange bearing in the bottom of the steering column and it greatly reduced/eliminated the slop in the steering as well as in the steering column/wheel. I highly recommend it and I believe this bearing is cheaper than the original plastic parts so it's a win-win. If I read this thread correctly, he made this modification on a '74 column. Good luck! :bigthumb:
http://www.cuda-challenger.com/cc/index.php?topic=91398.0
Wouldn't your column serve as the best reference as to what part it needs ? I think 74 is unique isn't it ?