I believe the FE pumps
oil to the valve train from the block, through the head gasket, then through the head. The head gasket is most likely letting the
oil leak over to the coolant. There is no bolt that goes through both
oil and coolant, to the best of my knowledge. I suspect you looked right at the problem, the sleeve sits too deep in the block, therefore the head gasket is not sealing.
I'm surprised, sense you knew there was a problem and had it apart, that you didn't have a good machine shop look it over for you, especially after noticing the sleeve issue. I hate to kick a man when he is down, but you should learn from your mistakes. If you learn from every mistake, someday you will become a genius.