After scraping some crud out of engine, I actually found the oil drain back holes. Looks as though there was a hole above distributor gear, but wasn't machined on later models. Maybe drilling it out and adding a standpipe may help with ventilation.
Anyhow, I saw someone mention putting a breather on the draft tube and mounting the PCV on the valve cover, I kind of like the idea.
A clamp on air filter would go right over the draft tube.
http://www.jegs.com/i/Airaid/028/775-138/10002/-1?parentProductId=
