I have 3.4 cams & cam cover. That chain is cheap & you should buy new.
You cannot replace just the cam cover, the cam cover and cylinder head are machined together as a unit to create the cam bores.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
I have a bin of stuff left over from an '01 2.7 that I didn't have the heart to scrap yet. The engine was full of debris from a broken rod. There is a cam cover at the bottom of the bin. I have no plans for it. Let me know if you want more info or pics.