[robnolimit]

Spring rates for stock style C-10's seem high, but this is do to the A-arm ratio. Here are some stock spring rates
Moog # 6082 722 lbs/in 6 cyl, and light v-8
Moog # 6542 842 lbs/in std v-8
Moog # 6102 1015 lbs/in bigblock, longbed c.s.
Moog # 6104 1016 lbs/in 3/4 ton, sits 1/2" higher than #6102
Moog # 6454 1060 lbs/in 3/4t bbc, c.s, 1ton
So, Hotchkis' 1100lb may not be so heavy. I currently have the #6082 spring with one coil cut in the JT project, and it is too soft for me. I'm going to swap in the #6102 springs next week. Going to track test it tues. with the soft springs. All my number crunching shows me a 950 spring, but we'll see.
When it comes to frame boxing, i'm not a big fan of full chassis boxing, as it can lead to a cracked frame. Bracing key areas, and creating triangles is a better aproach, check the earlier posts.