Just to be sure it is not the head gasket that is bad you can pressurize the cooling system, remove all spark plugs ,( the 3 in the rear can be a pain with out a lift) crank over engine and see if any water comes out of plug holes. If it is the head be sure to mark which push rod went where. Had one in our shop that a friend of a friend of the customer did the fix and bent several valves.