1967 Dodge Dart Steering Column

[George Mirza]

The column length can be changed by breaking the two plastic shear pins in then. Once they are broken you can make them the lenght you need. I'm guessing they were designed to collapse in a collision. They are two piece and one fits inside the other. After they are attached to the steering box and steering wheel the lenght can't change.
Only issue you may have is the splined rag joint on the steering box end, I believe the manual and power boxes use different diameter splines. I have used a steering box to column u-joint in place of this, several companies offer them.