Water pump or head gasket?

This very well could be a head gasket but it most likely has other issues as well. You will need a complete diagnosis as we can't guess here on such a big job. You are not going to want to just start doing a head gasket without knowing for sure. You can buy kits that can test the coolant for exhaust gases. That can tell you if it's a head gasket issue. Or use this link to find a good shop near you. https://repairpal.com/repair-shops Alex