If you can't afford a dremel tool and new bearings for the SC, don't. Just put it back.
If you can afford that, just smooth and clean up the outlet and inlet (NOT INSIDE WHERE THE ROTORS ARE). Port sizes should be SLIGHTLY less than .9 by 1.9 inches on the LIM to match the cylinder heads.
If you've never done anything like this, think twice. It takes me about 2 hours to do an L67 LIM alone, and that'* after well over a dozen. I spend about twice that time on the supercharger, and that'* with air tools that work a bit quicker than a dremel.