If it is an Edelbrock intake and you are using the breather hole in the intake, my guess is that the problem is in the lack of proper baffling on the under side of the manifold. I had a very high oil consumption issue when I first ran my Edelbrock intake. There was even a note that stated not to use a pcv valve in the intake/ lifter valley hole due to oil consumption issues. I put a pcv valve in my oil fill cap and a straight tube from the intake hole To my air cleaner and still had oil pushing into my air cleaner. I resolved the problem by making a small aluminum baffled tube to connect the intake hole to the air cleaner, no more oil up into the air cleaner. You may need better baffling to prevent oil pushing out the breather.