I have a pair of Crane reproduction dripper valve covers which are correct? for 67-68? Camaro big block. These are super accurate high quality parts.
http://www.cranescorvette.com/pr02.htm
If you are interested I can send you photos and you can determine if they are correct or not for you application. These are USED and I am asking less than 1/2 the new price. $240.00 plus shipping