[patrickt]

Google some pics of your carb so you know exactly what you're looking for. There's a pretty big vacuum tube towards the rear that is for the brake booster. Maybe you have that hooked up to your PCV. If that was just unplugged and completely open it would be a monster vacuum leak. Then you're going to have a smaller vacuum tube, mine is on the front base of the carb slightly towards the passenger side. When I put a vacuum gauge on it I have to use a tool, I can't do it with my fat fingers. Then there will be another tube, maybe on the primary metering block. Once you get the hang of looking for them they'll jump right out at you.