Polock- I asked the Baytown Greaser the exact same thing, when I get an answer I'll post it here. I just bought the front sprocket and spacer from Zipper's. 23T front and he suggested 52T rear. The first guy I talked was a total FUCKING PRICK, but I called back later and spoke with Patrick who was cool.
They wanted $90 for their PBI Aluminum sprocket, but you can get steel for half that which is what I'll do. I plan on 51T, this will get me close to the stock ratio (it's an 883 btw).