Hey Jeff. Just a thought. Ck and see if the valve cover is where the leak is coming from. If it is there, it is an easy fix. Or, take off the breather and start the car. Shine a flashlight in between the intake manifold and throttle body to get a look at the valley under the intake. If you see oil there, chances are the head gaskets are leaking. When this happens, that valley fills and drains in an over flow hole and runs out a weep hole from the back of the engine. It would make you believe that the rear main seal leaking. I had this happen to me diagnosing an oil leak. Funny thing, the engine ran ok despite the bad head gasket. Hope this helps.