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For the rear, you have a number of options. Add-a-leaf spring, either purchased or junkyard spring pack would help give the rear slift block is another option, between the axle and spring. A longer spring shackle can also give some rear lift.
Add-a-leafs? Dosent he need new coils or coil spacers?

89 K5 Blazer,TBI 350, 700R4, 6" lift, 40" groundhawgs,3/4 ton 14 bolt rear, 3/4 ton 10 bolt front, 4.88:1 Gears