I had a guy give me a set of cam covers off his 06 GT Mustang since he knew I do polishing of various parts.
I was a bit board after making a big sale today so I took one cover and put it to the wheel to gauge the quality of the metal and casting. There was a fair amount of porosity, it was nothing that is going to be insurmountable and just a rough prep and slight buff shows an outstanding promise to make a VERY quality piece when fully prepped in a more through sequence.
Here are the results of the quick job. Bare in mind that was just to give me an idea of what the end product will look like.

Sorry for the poopy pics. My Camera is out of batteries and had to borrow my partner's camera in his office.