I don't know if you have noticed, but there are now repro "L78 - LS6 - "COPO 427" fuel pumps being offered on eBay, DELCO part number 40727. I don't know the seller, and I don't know anything about the pumps..just an fyi.
http://cgi.ebay.com/ebaymotors/ws/eB...category=34198
-Sam