Thats funny, I have an old style 9375 that came from the factory with no brass bleeds pressed in the holes and was built that way on purpose. One of the best working out of the box 1050's. I saw a jet chart at a well known carb builder, some of their 1050's had no bleeds either. It is not a complete fix, but will tell you if you are going in the right direction. The reason to convert to a 2-circuit.