Do a search for "Busa Gearing Chart", there is a spreadsheet out there that is already populated with the Busa gear ratios and you can just plug in your gear combo.
When I was running mine on the street, I went with 18T/40T and it made all the difference in the world. I think it would be about the same if you go 17/38. Trust me, 18/36 is going to be way too tall for your purpose.