X2 on what Matt said. Use the 4 inch spacer above te strut that Superlift provides but don't install the preload spacers when assembling the struts after you cut the coil off the OME springs. I would start with the lowest setting on the 5100's and see how it sits first after it levels out. From there if need be you can adjust the strut for more lift and add Matt's rear spacers if the XK isn't level to your liking or if you need a hair more lift to clear those 35's.

Make sure you check out the rear pinion angle after the lift is installed. I believe a few members have installed rear adjustable upper control arms to get the pinion angle set of it was an issue. Yours might be fine once everthing is installed. Can't wait to see it done!