Ok, I made some progress today. I bought a T with compression fittings for copper tubing that I screwed into the manifold. Then I used 3/8" copper tubing on both sides-one to the pcv and the other to the brake booster. Then I crimped down the copper tubing to limit the flow but keep enough so there's no pressure buildup in the crankcase. The brakes work better now and there's still no oil coming out the dipstick tube. This is what I get for trying to improve something.
