The body lift will be where you'll have to get most of the lift from. You can swap in a set of Heavy Duty 3/4 ton coil springs (stock replacements) in the front and put lift blocks in the rear.
Here's a before and after pic of my 78 C20 2wd, after swapping in Heavy duty coil springs up front (aprrox. 2 inch lift) and 1.5 inch lift blocks in the rear.
BEFORE:
AFTER:
