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I'm almost positive the head bolt does NOT go into an oil passage. I had the head off '87 last year (replacement) and IIRC, all the bolt holes were blind - did not enter any coolant or oil passages. The leak you mention is almost guaranteed to be from the #2 intake runner where it meets the head, this is a VERY common leak, and is right near the head bolt. The other (less likely) cause is the head gasket leaking oil that is appearing out the bolt head, but I really doubt that. I sure wouldn't pull the head off for this!
BTW - you don't have very high pressure in the cooling system when the engine is cold... do you?
Good luck,
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