In a food processor, combine the vanilla wafers, 2 cups of the confectioner's sugar, cocoa powder, orange juice concentrate, and corn syrup.
Process until the cookies are ground to crumbs and mixture is evenly blended.
Add the pecan pieces and pulse process until the nuts are finely chopped.
Transfer the mixture to a bowl and form into 1" balls.
Roll balls in 1/4 cup confectioner's sugar** to coat.
Store in an airtight container in refrigerator for up to 1 month.
**We always rolled our balls in regular granulated sugar. If we made them at Christmas time, we dyed some of the sugar green and some of the sugar red and rolled 1/2 the balls in the green sugar and 1/2 the balls in the red sugar.