I tend to agree. Lots of engines never ran a PCV system. They were OCV, or open crankcase ventilation, with a pipe running usually out of the intake valley straight to under the car and venting right onto the road. The only reason I brought up the PCV is because since it's a street car, he may have inspections, plus, the PCV does aid in evacuating the crankcase while putting a positive vacuum against the rings. But it's certainly not a requirement. Engines were around what.....50 plus years without them? Using a PCV system works best for me, so that's the only reason I even brought it up. Something more than a lack of PVC or proper venting is the cause. Maybe too much blowby, maybe a leak, maybe both, but something is certainly wrong.
