a-904. Still leaking after rebuild! :(

The vent is in the bellhouse ,at the top of the pumphouse.If you overfill it at first start, all the rotating parts inside which are now swimming in oil, fling the oil everywhere . Some can find its way to the vent.When the TC fills up the level stabilizes. If its still too high, it will continue to vent it until the level is below the rotating parts.I have accidentally overfilled my 904s from time to time. A half liter,oops quart, seems to be accepted without venting.