Chris,
My experience with something like this has been with a cracked block. Nothing will leak until it's under pressure and hot. I've never had any problems with head gaskets, and if was the top end, you'd know about it from other symptoms.
One question, though... when the head was off, was it machined before reinstallation? If it was overheated at any time, and reinstalled with nothing more than a new gasket, that might do it (although I suspect you might see residuals leaking out of it).
Keep us posted.
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