I'm not concerned about the engine except for changing compression and cam everything else "should" be in order. The reason I want cog drive is I have a friend who had a Vortech on a 89' mustang efi and when he started putting some boost to it and some serious rpm it would burn belts and sometimes throw them. I've read a little about cog belts and it seems for weekend driving they are ok but tension is an issue, they can't be too tight and they have to be frequently checked.
Have you heard about having to cut on the corner of your valve cover for clearance of the supercharger?