when I first lowered my 79 I tried the shackles and hangers and the hangers didn't fit. They are different for a 1/2 ton than a blazer. So I used a flip kit and notched the frame. Its very low...probably due to sagged springs. I would say if you were to flip it and get the leafs re-arched for a bit more loft you'd be ok. Or you could maybe install another leaf. Thats usually good for another inch lift.
Thats on 17" wheels and using 3" springs and 2 1/2 " spindles in front.