Greets.., Diplomatically speaking.., please indicate your year model. Notice that you can insert said, and additional info., at the bottom of your post. Helps others to "hone-in" on your vehicle's particular attributes, or detriments, and how to deal with them when authoring posts to you.
My mere 1.5" lift gives my vehicle certain pluses, i.e., a bit larger tires, but required the 'T'-case spacers, (as part of the warranty), 'relieving' motor mounts in the process of proper drive train vector.., all really rather simple tasks. Went with the matching front coils.., all good. Any higher than 1.5", I would probably have to consider a tranny swap-out, SYE, etc. The metallurgy of the rather stock height replacements you are considering are subject to discussion as per the longevity you might expect from them. My new to me XJ with 170k miles badly needed replacements of the OEM leafs. Hence I replaced the OEM, with OME. I expect the replacement coils, and leafs to outlive the vehicle as OME are tauted to be very well made with a concern for dealing with miles, and miles of Australian washboard roads. However, OME did have a recall on their military type leaf system as the metallurgy was not proper. That said, it is also a fact that many XJ parts are made in china, and other places where the parts are either good, or bad. Perhaps it's better to really investigate each part replacement as to quality, and longevity before one surrenders hard earned cash on sub-standard 'cloned' parts. Happy Trails NorCal--Truckee.