I've got the 5658/5413 combination with tall ball joints, Fbody sway bar and Hellwig rear sway bar. Currently have QA1 single adjustable shocks, but haven't really found a good adjustment for them, so am going to go Bilstein's, since they get such good reviews. My car sits 6 1/2" to the frame in the front and 7 1/2" in the rear. I'm considering swapping front springs to the 5660's, just wondering if anyway else has done this and can give feedback. I wouldn't mind it sitting up slightly higher in the front, and the handling isn't as balanced as I would like. Seems to understeer a touch. Just wondering how the ride compares. The 5658 are firm, but not jarring. TIA!