I am running the 1 3/8 bars, Eibachs, bilsteins, poly bushings, JL's braces. We have pretty decent roads around here for the most part but I take the car a lot of places too. I haven't had any problems anywhere since I got everything straightened out. It will lift a back wheel angling up driveways on my car but that is the only thing that really annoys me with it at all. And it handles awesome. Someone I know was talling me they were working the corner at the auto x I went to in Iowa a couple weeks ago and someone else ont he corner made some comment about check out this guy with this big *** car. I proceeded to drive a sweet run and lay down a really solid time and the guy I know said the other guys on the corner didn't have anything else to say about the big *** car. Its a decent set up, with all the kinks now worked out I like it. If you just want to buy stuff that you can put on without much thought, I would recommend this set up, although after some talking to guys, reading and thinking I want to start screwing around with it more and might change everything around but it won't be cheap or easy.
Advise: double nut your rear end links that come with the Addco bars. You may also want to do some shimming of the front mounts to get things to bolt together right. Daily Driven has a post about what he did, I did something similar but instead of fabbing stuff up I just used two washers in each position. When putting it together, if something doesn't look right to you, don't leave it like that just because the instructions say it is good.
Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII
2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.