I found that out as well. What I did was to move the lower shock mount the top of the axle, between the axle and spring pack. It required me to fab a plate to weld to the shock mount and the use of a longer center pin. The plate is only 5/16" inch thick so it didn't add to much space under the shim. Please keep in mind that I did remove 3 leafs from the spring, so the extra 5/16" was not really an issue as I will be using shocks designed for a lowered truck. As a side note, I had thought that I would require shorter u bolts after removing the additional leafs, adding the extra 5/16" plate allowed me to use the factory length u bolts with no problems.

link for shocks: https://www.brotherstrucks.com/1955-59-CHEVY_GMC-TRUCK-FRONT-GAS-SHOCK/productinfo/FGS5559/

~ Craig
1958 Viking 4400
"The Book of Thor"
Read the story in the DITY
1960 Chevrolet C10
"A Family Heirloom"
Follow the story in the DITY Gallery
'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane