Good afternoon.
The heads will have to be removed and inspected. That is not an option as they could be cracked.
Since the oil is milky, there could also be bearing damage on the bottom end. When coolant gets in the oil, that goes to the bearings. The coolant takes the babbitt off the bearings and that will cause main and rod bearing failure.
It is a lot more than just head gaskets. Sorry, you may want to consider replacing the engine at this point.
Roy
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Sunday, September 29th, 2019 AT 2:18 PM