I had my leaf spring relaxed a bit and then just flipped it; however this means that the limit of the slam is the shockers being bottomed out and lends itself to something of a po-go esq ride, but its great fun. For the back i simpy cut 2 coils out; he sits about 3 inch off the ground - which isnt enough to get a trolley jack under! For a pucka job you can get adjustable front coil-overs from blitz and then fabricate a tie bar for keeping the track together (there is a track swing bar kit on a few of the better parts sites, but it aint cheap) - I know mines a BIS but the principle is the same.
I'm sure ive seen some 125/70/12's somewhere, you could always have a pair of those stretched onto the fronts if you are really eager.