You can also buy a "Rear Up Front" (RUF) kit from many of the vender that advertise here at zukiworld.com. The kit comes with a set of mounting plates and bolts that move the rear attachment back to compensate for the length of the Samurai rear springs. Hopefully, it also comes with instructions on how to keep you wheelbase stock by drilling a new guide pin hole in the spring pack.
I have this arrangement and it, at least, got rid of the inverted arch of the stock front springs. I didn't notice any big ride improvement, though. I AM happy with it, though!
I Hope that this helps!