If you have oil in coolant and vice a versa it is a fairly unique situation so you need to focus on where the two can cross paths under pressure, places like an oil cooler if it has one.
Under pressure oil can get pushed into the cooling system then once the engine is shut down hot the coolant is now under pressure and can be forced back through the same leak into the oil system.
A cavitation leak can let coolant into the oil or compression into the cooling system but not likely oil into the coolant.
While I am not familiar with the engine you are working on a head gasket leak between a pressurized oil passage and a coolant passage does not sound very likely.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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