Mix the wafer crumbs, cocoa, and 2 cups of confectioners' sugar together in a bowl. Add the chopped pecans. Stir in the corn syrup and bourbon, mix well. Dust your hands with a little superfine sugar, roll dough into 1 inch balls. Roll each ball in the remaining confectioners' sugar until well coated. Store bourbon balls between layers of waxed paper in refrigerator or in a sealed metal container for at least 12 hours before serving. They can be stored for several weeks in a closed tin. Makes 3 dozen