Have a machine shop pressure test the cylinder head. I'm going to guess they find a crack in one or both combustion chambers where the leak is evident. If the cooling system had been pressurized before you pulled the head, it would have been very obvious where the leak was coming from. It's not always a wise choice to start taking things apart before doing some basic diagnosis first.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!