Just to ventilate from a spot better than the valve covers. Venting directly from the crankcase is better. Since I have no vacuum source right now it will allow it to breath freer than the valve covers would. But I do plan on running the rear to a vacuum pump in the future, and at that time just putting a regular fuel pump blockoff back on.
Like I said, I stole the fuel pump block off idea from Jon Kasse:
http://www.popularhotrodding.com/eng...3/0405phr_emc/
By the way, after I realized that the oil leak was from the back of the manifold and thought about it for a while, I realized that the only way oil could be getting up there was if I left the plug off of a galley. Sure enough I pulled the intake off and forgot the 3/4" plug for the rear galley. Doh!