Thanks Fred!
The engine is a 116 and the oil is definitely coming from the rear end of the head gasket. I have not separated the upper/lower intake yet however, the rubber grommets look ok. I just unbolted the exaust manifolds this morning; do they come apart in two sections when the spring clamps are released. They seem reluctant to separate very far from the heads. I wonder if I should just start unbolting the heads and when I pull up on them, the bott manifold bolts will clear.