my experience w IFS chevy's is that you don't need the keys... the stock keys when cranked all the way up will put the suspension high enough that you start hitting the upper bump stops on every little bump in the road and get an uncomfortable ride... Generally if you crank the bolts in till you have about 1/2" sticking out it is as high as it can get and maintain a comfy ride without buying a "real" kit with new control arms.
You can experiment easily for free.. just crawl under and crank em up and test drive
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