Just do a search on 'rebuild' in the forced induction forum. Mine isn't the only detailed job. If your SC isn't leaking oil, or making any other noise and feels like it spins freely, just do the coupler and oil.
Pulling the lower intake won't take much longer after the SC is off. You need to replace the 2 seals at the ends of the block just beneath it, but at that point, you'll have to replace the gaskets between the lower intake and heads, too. You may just want to by the 'head' kit, and set the 2 head gaskets aside. It should come with everything you need. Go AC Delco on that.
This isn't a tough job at all. Just buy a $15 service manual before starting, but make sure it has the SC pull in it. Tearing the charger apart, you'll need our posts as reference.
This might come in particularly handy. It'* an M90, but almost identical in procedure:
The photo gallery on my website has tons of teardown pics. Click on my sig pic, and surf around. At the bottom of my links list, above my photos, you'll see a link to the gallery.