A mates '55 flash showed some evidence of a weeping head gasket so we lifted the head on New Years day. Both the front oil drains showed blow out and that was only enough to wet the fins, not leak back beyond the barrel. So not the same as your problem
It'll go back on with some copper spray on the annealed gasket, once the valves go back in.
Exhaust clearances were tight and the exhaust valves both leaking and corroded on the seat, one quite badly. Not wishing to highjack the thread, all the valves are just outside clearance but as the owner has only just bought the bike I think a bit more bonding/riding time over the summer is in order before the head gets refreshed properly. I found a decent spare exhaust valve to replace the pitted one and all the seats have lapped in nicely with a fine paste, Certainly plenty of clearances presently.
My FIL's Benelli twin had a bad oiling problem out an exhaust and it turned out to be a failed guide, the bottom half of the guide had broken up and vanished. So oil was getting down the guide remnant and that cylinder didnt run reliably, kept chiming in but not at idle.