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The first thing that I do, when I'm trying to free anything that's stuck, including bolts, is this: apply heat with a heat gun, then melt candlewax into the joint. You want to get the parts hot enough that the wax wicks into the space between them. This sometimes means that you continue to apply heat as the wax works its way into the joint. If you start seeing little bubbles in the wax, as if air is coming out of the joint, that's usually a good sign that you got it warm enough. This is something like sill-flossing a copper pipe joint, if you know what that is.
I have yet to find something that this process didn't work on. It's vastly more effective than other penetrating oils. Given that there is also a gasket between those two pieces, you should also be able to work a putty knife, or something similar, carefully into the joint and pry it free. Just make sure you don't more the faces of the joining surfaces of the cover or the head.
If the other photo is representative of what yours looks like when you open it up, some serious cleaning is in order.
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