Depends on your plans. A 6" spring lift has a lot of arch. It limits articulation some. You will probably need to extend the drive shafts too. The ride will be a little harsh.
I had a 4" Rusty. I didn't use his shocks ( I heard they were not that great). I loved it. Ride seemed good, I beat the crap out of it and it held up fine. No drive shaft lengthening (your results may vary and you may find the drive shaft becomes your limiting articulation factor, which is not good).
Added some sliders and a locker and the truck could go most places.
82 Cherokee WT - SOA/SF/agr box/Borgeson ujoint steering shaft/401/performer/holley TA/HEI/BeCool/727/np208/d44(aussie)/amc20(ARB)/BFG 35X12.5/Corbeau Moab Seats/RCI 6point Harness,Hella Aux lights/tuffy console/killer32 slider bars/custom bumpers and roll bar/Alpine head unit/amps/speakers 2002 Liberty Limited Early edition - Basically stock