How was the idle? Hard to tell from the pics, but the gaskets look like maybe they were sucking air up under the carb. Front carb, back of gasket and rear carb back of gasket. Is it the pic or me? The maybe air leaks would affect those cylinders that are fouling. I just can't tell. I know Nick sold me some firecore wires that mad a night/day difference . Are the air/fuel mixtures set with a vacuum gauge? I just am not sure at this point