It appears that the bearing retainer is missing at the end of your column.
I'm not sure if the links below will answer any of your questions, but they provide schematics and lots of good info on the tilt columns. I've rebuilt a couple tilts using this info as a reference.
http://67-72chevytrucks.com/vboard/s...d.php?t=157328
http://67-72chevytrucks.com/vboard/s...d.php?t=329008
http://67-72chevytrucks.com/vboard/s...d.php?t=382546
http://67-72chevytrucks.com/vboard/s...d.php?t=515103