I have done exactly that. I have factory liven 15"mags on my ae82 and it is also lowered on super low lovells springs. I had to cut a portion of the plastic interior guard off to stop rubbing and flared both front quaters. All you need to do is bang out the factory flared lip more with a panel hammer and dolly then just bog over the top, comes up all good. Be aware when you lower it tht with the 15"s on, the rear wheels rub terribly on the mud flaps and i recomend you just take them off
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you may also need to buy stiffer for front and deffinately rear. Hope this helps a bit