Look the gasket over very carefully at the coolant passages, if it was a head gasket leaking coolant there will be evidence of coolant travelling from one of the passages to the exterior of the head, the area that is damaged is an oil passageway (hence the oil leak) but you said the coolant wasn't leaking into the oil but onto the ground. A coolant leak to the outside generally will leave leak stains, look for them where they would run down the head or block, look the intake manifold, water pump & radiator over very carefully & all the rubber coolant and heater hoses. As I said before it would be highly unlikely for the head gasket to leak both oil & coolant at the same time without the two mixing, but if it happened there should be obvious evidence of separate leaks at an oil passage and a coolant passage. The broken head bolt must come out, whatever works. You may have to get someone to weld a nut to the stub end, cover the rest of the engine first, welding slag in the engine is not good. I'm surprised it isn't easy to unthread with the head removed, all the pressure holding it tight is the bolt head against the cylinder head- unless someone put thread locker on it. Head bolts need to me lightly oiled, no sealant, & the holes clean. You're going to need at least one head bolt, check the others, if the socket head is not crisp or you are concerned it may round in the future replace also.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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