FMX just a point to consider when changing the arch in leaf springs. If you change the arch in a leaf spring and then install it, it will usually sit a little bit higher for a period of time untill the weight has been on the re arched springs for awhile.

I had some springs for a 4x4 blazer rearched to lift it up 4"s and after a little while they ended up being about 1" less than when i had first put them on. So if you do this i'd do it so the car sits about 1" higher than you want it and it should "settle" to the height you want after awhile.

BG