I've been checking out some mikuni rs carbs out on ebay new and theres only a few bucks difference between the rs 38s and rs 40s. I have a 1990 gsxr 1100 stock motor in my 86 1100 with vance and hines pipe stage 3 jet kit and dyna 2000 ignition. which is the better option? 38s? 40s? or should i stick with rs36s?