I believe that question has been asked before and it was stated there is no way to really tell the difference. The part number was on the box and not cast into the cover.

The new repop that Ames performance has are pretty well made. They seem pretty heavy and chrome is nice. To rechromed you two valve covers it will be pretty costly. I would say between 400-500. Re-chrome is expensive and the repops are 100. Since you cannot tell the difference you will have to weigh if it is worth it.