The backstory : Inherited a 1978 Stock FJ40 from my dad. Engine oil looked good. Took it for a spin and checked the oil again after about a 20 minute drive and noticed it was milky brown. Decided to pull the valve cover and this is what I was greeted to. I suspect this is a result of water getting into the oil. Failed head gasket I suspect or ??? Soliciting your expertise and opinions. I'm thinking to start I'll remove the head. Anything else that could be the culprit. Cracked block I suppose is also an option. Thanks