95 Impala SS rear end into 4th Gen?

I found a deal on a complete rear end out of a 95 Impala SS with the 3:08 posi and disc brakes. I've read that it will bolt into the 4th gen chassis with no problem but I've also read that some of the control arm holes aren't exactly the same. Anyone know for sure? I just wanna know what exactly is involved in the swap.
Anyone here ever done it? How about making the rear discs work? I know the bolt pattern is different but that's not a problem.
Any help will be appreciated.

we put a caprice 8.5" rear end into a 68 442, it was a squeeze with the upper control arms but it worked.