[Mike C]

My own thought on this is why? The open knuckle front is so much better for turning radius, just swap it in complete.

Converting a Dana 25/27 to discs using the GM parts and Jeep rotors is a common swap, but only because you can't get a drop in that uses same gears like you can with the GM.

So, not answering your questions, but if you are going to swap something, I'd swap the whole front axle with the caveat that gear has to match or you have to swap the gears in the housing.