Centering a steering wheel

No I did not find the master spline but I did find on the spline end in the cab a half moon has been removed from the end of the rod. While driving I noticed the car drove straight while it was straight down. I don't know if it is supposed to be there but it is and I can use that to fix it.

I do have a new issue though I think I may have screwed up the linkage between the steering column and the power steering box. I found as site describing the rebuild but I have a question. Do I have to remove the entire column? Do I also have to disassemble the column or can I leave it in the tube? If I have to disassemble I am going to replace as much inside as I can any suggestion where to find the internals?

http://www.1962to1965mopar.ornocar.org/ml-houstons-steeringcoupler.html
http://www.1962to1965mopar.ornocar.org/ml-houstons-steeringcoupler.html