OK, I got it, I should have read more carefuly. So cheapest is probably to get some stock springs from the Junk Yard and then get some spring spacers. They generally give about 1.5" to 2.5" on the coil spring.
Just do a google search on leveling kit for your year truck. You'll see this type of spacer.
Plus go to the regular 67-72 forum and look at the sticky for show your tuck pic threads. lots of trucks to see in stock incarnation!
http://67-72chevytrucks.com/vboard/s...d.php?t=646108 
