If you're talking about the note from cyanmauve, I think he's describing moving the holes on the bracket, not the knuckle. This is a common adaptation on putting the PBRs on 94-95 knuckles, i.e., redrilling the bracket to move it slightly. When reducing the diameter this may mean that some of the bracket needs to be ground off to eliminate interference with the knuckle.
Sometimes this makes people nervous because they may wind up with an elongated hole in the bracket rather than a nice, round hole. Some have opined, and I've heard Todd say this, too, that if the hole is elongated radially from the hub, which would be the case, then there's no real compromise in strength or integrity. This has been done many times, so I guess there is evidence that it can be made to work.
I really don't know where you'd redrill a 94-95 knuckle for new mounts if you cut the ears off. The <93 knuckles have a really flat, stout portion that is an obvious candidate for drilling bracket mounts, but my recollection of the 94-95 knuckles is that they wouldn't be as friendly to such a modification. I've got a set sitting in the garage, I should look at them tonight.