The best fuel delivery setup is having a vapor separator with its own pump. They work extremely well, make sure the return fittings/hose is larger than the inlet so no pressure can build. I like to use an external pump feeding two carbs. Its important to either leave the stock restrictors in place or use an inline jet for each carb. The only reason that I would drill the stock restrictors is for using very low pop-off in a freestyle application but never for skis that run WOT.