It can be a bit of a challenge to do a search if you don't know what you're searching for! Anyway, I usually just use Google to search this website by putting 67-72chevytrucks.com in the search box along with whatever thing I'm looking for. By the way, schematics are available for download here:
http://67-72chevytrucks.com/vboard/s...d.php?t=185856