I'll probably try this route. How much do you think this repair would cost? Also how likely is this to break? Will it be possible to repair it without taking the engine out?

I was replacing my head gasket, and i saw this. What do I do now? Can this be repaired? If I have to replace the block, how would I do that? How does this even happen?

I have a 2004 Land Rover Discovery (V8 gasoline). It is misfiring and the head gasket is blown. All the mechanics in my area refuse to fix it, so I guess I will have to do it myself. I have no experience in replacing head gaskets or taking apart engines. It has had a head gasket replacement in...