At this point, I'd just replace the nosedrive entirely, but not the whole SC. The bearings may have damaged the nosedrive housing.
A rebuilt nosedrive is available from www.canadiansuprcharger.com
You'll have to pull the entire SC to replace it. Not a big job. You'll need a SC gasket, 2 yellow o-rings, and a bottle of SC oil.
It'* a good idea to replace the fuel injector o-rings at the same time since you'll have the fuel rail off anyway.
Another hour of work would enable you to change the LIM gaskets and replace the plastic coolant bypass connector with a metal one (above the water pump in the LIM).