Run an evac set up. I had a similar problem on an old nitrous motor combo, was blowing oil out all over the place. At first I thought I just had lots of leaks but realized it was being pushed or forced out. Weld tubes to your headers near the collectors and run lines from the breathers. This does pull a vacuum and will help pull crankcase pressure out. Just be carefull to check that its not pulling alot of oil out or you will have a mess. I put a catch can between the header tube and the valve cover breather tube to collect oil with no breather so it didnt lose the vacuum at the first breather or atmosphere source.
http://www.jegs.com/webapp/wcs/store...0002_745564_-1