Could some one please help recomend what will be the best bore on my stock carbs! I now have a 420 big bore, Dune port, T-5's, boost bottle, intake, Cool heads with 18cc domes. I've done some research and it seams that a 28mm oval to a 30mm seams to be the genral consensus! I'm not looking to spend alot of money on new carbs and would really like to just use my stock if possible!