If your bike isnt already ported, 38mm is way to much carb for that motor. I would call andy at GRR, Jeff at fast, Eric at forward Motion or Jim at Passion. It all depends on your ridding style Porting will give you more bang for your buck!
I was in the same boat, But RNBRAD hooked me up . Your better off getting a used one from one of the hq members that is straight, PM Nyuk he will hook you up....
Clean them up and throw them in the front yard with a forsale sign on them
And post a pic on every forum you are a member of, Nothing like free Marketing