Crankcase ventilation

[TheJDMan]

Does your intake have a 1/4"NPT plug in the rear below the carb base? Some do and some don't. If yours does try moving the PCV vacuum hose to that location and plug the carb fitting. If not you might consider drilling and tapping one on the back side of the plenum. See if that helps. You could also try opening the secondary butterflys and then readjusting the primary idle screw.