One reason PCVs get disconnected is because a bigger cam is installed in the engine, & these have less vacuum at idle. Not enough vac to pull in the pintle inside the PCV.....
So the PCV gets disconnected....
Interesting I think the cams may heve been changed I could get a vac gauge and take some readings I assume from the vac port on the carb, but also from the breather side? I think the service manual gives some figures.