Check out the FAQ (frequently asked question) section
http://67-72chevytrucks.com/vboard/s...d.php?t=262547. This has alot of answers to MANY questions. There is a c-notch post for the 67-72 trucks. But for the 73-87 models look here.
http://www.73-87.com/7387garage/chas...n/csection.htm