I have this vintage pair of Yenko embossed chrome steel Big Block Chevy valve covers on ebay starting at $9.99 with NO RESERVE. These are real deal covers from the 70's. These can to me with a set of 14011077 aluminum heads that were found at an estate sale. I understand these covers are now reproduced. These are no reproductions, they are the real deal.
Here is a link to the listing for anyone interested:
http://www.ebay.com/itm/372586810945
Thanks and good luck,
Jason