I will be going the r1 carb route my self i have just put in a cam and ported then head and the port are alot bigger than the stock manifold holes and they cant be ported to the same size as their just to thin to port that far
so im planning to get a flange cut to match the port size and make my manifold from stainless steel most likely as i dont have a tig to weld alloy
i got a few quotes for the r1 carbs from bike wreckers they all want close to $300 which is quite abit but still alot cheaper than dual dcoes i think
I dont think it takes to much to tune r1 carbs there jets are interchangeable with dgv webers just changing the main jets to like a 1.60mm gets it in the ball park then its fine tuning
theres good info on this forum
http://community.ratsun.net/topic/7862-r1-carbs-lots-of-pics/