no, unfortunately they won't. Here's a guide to what will fit on a KJ and how much you need to lift to get larger tires to work:
I agree with JohnQ-the KJ is a nice jeep but doesn't have much room. That's why i'm looking for an MJ; seems like at least once a month i need to move something that won't fit in a KJ. I'm also looking for something i can mod without having to worry about voiding the warranty.