To add to the conversation...
Several weeks ago, I had the same relative issue, oil was leaking down the driver-side engine block where the bellhousing connects. When I was changing out the clutch, I pinpointed the problem to the head gasket. When I pulled the head, the gasket was COVERED with oil in that area. Even the head bolt was wet (all other bolts were clean but that corner).
After replacing the gasket, no more oil leaks for me
