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Re: Stock front axel on a K20??
Using optional 4" shackles (same as stock) would make the kit net 0" lift. To get an idea of what the length of a shackle does look at the aftermarket rear shackle flips. The new bracket and compression shackle drops the rear of spring a whopping 8" to get the 4" lift. Moving only one end of spring nets half of lift or drop.
Chevy never used a 52" spring in the front of consumer trucks. All the 52" are from the rear and will have more arch due to them using a tension style shackle. Stock rear replacements will still net 4" with kit and 4" shackle. Least expensive option would be to pick up a pair of salvage 52's, they have probably sagged. See were they sit. You can have them de-arched to fit your needs.
Other option is custom springs, probably $600-$800 pair. I think Ford did use a 53"-54" on the front of F250's, they are pretty flat. Used on TTB and straight axle. Might be something to look into. With the springs being a bit longer the rear shackle mount position would most likely need to be adjusted.
You are in the full custom category with what you want to do. Not much off the shelf will work.
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