Overheated now this!

[Sonceria86]

Hey Jeepers, so purchased my 05 Liberty 3.7 last month. When I went to test drive everything was good no lights on etc. Well next day engine light popped on , since it's a as is purchase not much I can do. Well got codes read and it's misfiring ok got ignition coils, spark plugs , oil changed. Well it overheated on me so got thermostat replaced and flushed radiator. Temp stayed on half but noticed it hesitation to start and I'm getting smoke from back end. No visible leakage but I searched and I found something that said check oil cap, well this is what I found. Can someone please help with my next move?

 

[seafish]

Sorry to say that it sure looks like that residue in oil is the result of either a blown head gasket or cracked head to me. Either can happen from over heating.