If you fit the long arms under the Jeep with 3" of lift, report back and let us know. And take some measurements before and after so we can see how much travel you were actually able to gain. That way you have hard data to back it up when your done and no one can tell you it was useless.
Are you going to look into someway to mount the shocks higher? Or lower the lower mount? I imagine the long arms will be able to droop farther than your shocks. Even if you bump stop first, measure the longest shock you can run without bottoming out, you will have lots of droop with those long arms. Fitting a longer shock at full compression will allow more extension at the other end.
88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Red XJ w/ 350k+, AW4, NP231, Locked Rear, HD Crown Leafs, trimmed to fit 33's, soon to be a donor
2000 Silver XJ, Drivetrain from the Red XJ, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's <=== In the works