A fellow CC member just PM'd me for a link to the valve covers, too. No specific link, as they are available all over the Internet. Go to eBay and do a search under "Fabbed" or "Fabricated 351W valve cover". You'll see many priced between $100-$150 for the pair.
You will then have to take them to a metal finishing shop (like a chrome plating place) and they have the right grits to lay down a really even satin (brushed) finish. I wasn't happy with the factory finish so having them gone over with the right equipment makes them look that much better. You could do this yourself with some 120 grit sand paper, then move to 180/220 and hit it with a Scotchbrite pad thereafter. But it's WORK and it's really hard to get all the lines flowing in the same direction (especially within the bolt hole recesses)! I now use 180/220 (can't remember which) to touch up any little scratches/marks, then follow with a RED Scotchbrite pad. Then some lacquer thinner on a clean rag and that eliminates all the black dust that you generate when you sand on aluminum.
Hope this helps others that want to go the satin route. It's definitely a change from polished and I'm still debating which look takes more effort to keep clean.
-Dean