Welcome aboard the best Chevy/GMC truck forum on the internet.
Here's a good start.
http://67-72chevytrucks.com/vboard/s...d.php?t=329008
Regarding the light, maybe forum members KevsClassics or 70shortfleet can help you out. They restore the tilt columns.
You can check the picture below to identify which tilt you have. The middle one is a true truck tilt, the top one is an RV tilt and the bottom one is a van tilt.