Assuming you are still spring-under-axle, you would install steel (never aluminum!) shims with the fat end forward between your front axle perches and the spring pack. This will have the effect of tilting your pinion down (hard on the ujoints) but improving your caster angle. You need 5 to 7 degtrees positive caster ... that means tilted back from vertical. This will prevent the "darty-ness" many CJs get after a significant lift... and will improve tracking and return-to-center.
Lots of good reading here, near the bottom of the page:
They are also a good source for steel shims.
When I had my '71 CJ5 with 3" lift, and swapped in a '74 D30 to replace the D27, I could barely drive over 30 mph and keep it between the lines. I got an alignment(didn't have an inclinometer)... that told me I was at 1° positive caster. I ordered 5° shims... installed them fat side forward, resulting in 6° positive caster... and after that the rig tracked straight and true, even at a scary 75 mph...
Dana 30 and Dana 44 Front Axle Caster Adjustment – Spring Wedges | jeepfan.com
HTH, let us know if you need more info.