So, what kind of 35mm carb do you have? If it's a Keihin PWK, and NOT an Air Striker, you already have 1 of the best carbs for your 4mil. Buy another one like it, some UPP or billet intakes, and 1 more air filter and you're all set. Oh and a cable.
I saw your other post about the carbs. Those filters are kind of small.