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Doug, these covers are probably manufactured in China somewhere, but they do have a billet base (that's the key!). Around $100 plus shipping on FleaBay. They seal up nice. I use a thick composition cork Felpro gasket (two pieces of cork with steel insert), seal them to the cover with Black Ultra RTV, and then tighten them down so that the cork compresses slightly over the lip of the cylinder heads. No leaks. Pay about $30 for those gaskets, but that and the flat billet rail make the difference.
BDR561, I tried to do it myself and it was a PITA to get all the machine marks to go in the same direction. So I farmed out the work to a local metals finishing shop for a total cost of $115. Maintenance (so far...keeping fingers crossed) is a rough Scotchbrite pad and a clean cotton rag dipped in lacquer thinner (be careful around painted surfaces!). Occasional scratches can be worked out with a little 180 grit sandpaper followed by the pad and lacquer thinner (don't ask how I know this).
-Dean
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