Scott,
The easiest thing two do when you are working with an assistant is to use a manual, review and agree on a procedure.
So here is the link to the manuals. Using the 72 chevy service manual pdf pg 47 (manual pg 1A-31) would be a good start.
http://67-72chevytrucks.com/vboard/s...d.php?t=558016
Or not
:-)