crank pulley

I need some crank pulley information and a pulley too! I'm looking for a crank pulley for a 71 Dart small block. If I can't find the right pulley I may need to make a spacer. Can anyone offer any help or a pulley for sale. The pulley I have is about 2 3/8 deep and 6 5/8 across (approx). The pulley I need has to be about 3 3/8 deep. Does anyone have any ideas?