I think it would drop it about 5-6". Springs plus axle diameter. Use to do it to slam trucks to get 5-7" of drop.
I don't think I would recomend it because of how close the tires are now and would be to the floor. There isnt enough room there if I remember correctly. Plus your springs will sag/ break in/ settle after a while, and decrease the space further.
MillerTime- Future Sabre Handler!!