34 keihin are going to be the old style pj model. the 34 pj's have been discontinued and they are still a good choice because they are cheaper, but they have been known to be a pain in the ass to jet and idle correctly. 33 pwk are made by keihin too which is the newer style, they will prolly do the best job for what you have. Maybe even some 28 pwk bored to 30, I would stick with pwk's. Some people like mikuni carbs, but I have no expierence with them except for the stock banshee mikunis.