Cranes Corvette does real nice work,be it plated or bare-(You Paint).
Scroll down to part numbers
V66P,
V65-6P &
V67P,depending on your applications.
http://www.cranescorvette.com/corvet...covers_427.htm
And here's a pair on Ebay that expire in 15 minutes sitting at $26.00..
http://cgi.ebay.com/ebaymotors/Valve-Cov...sspagenameZWDVW