its not that hard to do on a torsion bar truck,, ive got a coilover setup on the front of my mazda, 1 pump with side to side dumps. I would recommend getting some mini coils and cutting them down to about 3 or 4 turns to use on the coilover. oh yeah, the kit that you linked to is a front only kit, but the picture is a front/back side to side setup, so dont expect to get all the stuff in the picture. If you need pics of the coilover on my truck, or any help or suggestions, PM me and ill email the pics.
good luck
good luck