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You need 4" with a rear flip kit to make it level, for the majority of kits regardless of how companies label the amount of drop.You can cut 1/2" coil off the bottom and see how it changes if it isn't enough cut another 1/4 off and work your way down. I personally would drive it for a day after cutting. The problem you had before is someone put all the drop in the spring, which is a bad idea.
the front fender well is 1 7/8 (if i recall) higher than the rear in any situation, thats just how they are