Bear in mind that the idle fuel feed circuits MUST BE CALIBRATED to accomodate the additional air entering the engine. There are hydrocarbon energy (as oil and fuel vapors) in the PCV system that will also effect the idle and off idle fuel transition circuits that will need to be determined. If, the additional air is not accommodated, a large flat spot, almost to the point of a lean stall may develop. Likely, the static and dynamic ignition curve will need to be developed. Just be aware that it is not as simple as drilling the carb to accomodate a hose connection. Just my opinion of course....
BOB RENTON