Hi Jim,It's coming from the back left hand corner. Is there an oil gallery back there? I guess it's time to get the head gasket replaced.
If you are talking about just under the #4 (Rear most) exhaust, then yes, there is an oil galley there. Here are some pictures.
If it is, you will need to replace the head gasket.
Here is a thread I made to help if you need it.
Head Gasket Replacement for Dummies