You can always get a new PCV valve, then take the old one and drill it out. That will make a big leek you can't see or here. You just can't go to big or it won't run. There is also a slotted screw on the side on the carb venturi. It's about 1/4" in size. Remove that. It's hard to see but there is one there, or at least there was on my first gen carb. As far as I know it should be there. With it out you can't tell it's missing unless you look hard. I don't know what to tell you. Smog is why I went with what I'm doing to my truck. It would not pass so it was time to find ways around it. Droppedmitsu was having the same problem with his down pipe "not being stock" so he did the same as me with registering out of the county. It was worth it to us.