With the revolvers you shouldn't have to make any modifications to your existing shackle mounting points. You may need to extend your frame or have a solid bumper though so they have something to rest on.
If you are looking at moving the shackle mounts I would plan on doing that instead of the revolvers.
The 1" spacers will probably be enough, they are on my front end but mileage may vary.
I believe the CJ's are 3" longer, so your axle will be 1.5" further back. Not sure for certain, I will try and look it up later or someone else can chime in.
Mine handles fine on the street with the folding shackles in the front. It's just a bit chatty sometimes. A club member has folding shackles front and rear with YJ springs, he claims the ride is fine on roads. The problem shows up when trying to bomb fire-roads, if you hit bumps at speed your rig can bounce off of the springs and be in sort of a free fall state. Good shocks will hide most of that but you will want to plan on driving a bit slower then normal until you get the feel of your rig.