For short length symmetric springs, anything beyond 3-4" places the springs into such an arch to carry the weight that the arch counteracts the movement of the springs during suspension cycling. If you require that amount of lift, look into longer springs overall to be more effective to carry weight as well as perform. You could look at using Wagoneer springs with shackle relocation, but this will add to wheelbase so ds work may be required.
Or look at SOA setups. Yah, SOA setup requires more work in steering and brake lines, but the effect is greater that large SUA lift. The approach is a better angle and you can use stock, HD stock replacement, or low lift amount springs.
To get the nearly the amount of 6" lift, look at combination of lower lift, longer shackles/relocation of shackle mount, fender flares, and/or small body lift.
97 TJ SE lifted, locked and rubbered for fun
94 YJ SE stock, 225s, Trail Tested