This link should help give you an idea of how the truck will sit, depending on what components you use. The truck in the link, is basically using the Porterbuilt Stage 1 front and Stage 2 Basic rear. He started with a Stage 1 rear, but added to it from there. You can see the difference through adding the c-notch and spindles.
http://67-72chevytrucks.com/vboard/s...d.php?t=609897
Our Pro1 Air Ride Kit:
http://www.azproperformance.com/Pro-...its-67-72-C10/