I have a '68 GT6 with dual stromberg 150 carbs. When I turn the engine over, fuel leaks from the mating surface from the carb to the intake manifold. I have replaced the needle valves with new, and have checked the float (it floats). Something else must be letting the fuel get so high as to run out of the venturi of the carb, into the intake manifold. Any suggestions? Thanks, Mike