70-74 Z/28 LT1 Valve Covers
 

These are far from pristine, for sure, but if you're putting something together on the cheap these might be for you. I've tried to highlight all the issues in the pics below. I believe the part numbers are correct for 70-74 Zs and possibly Corvette. $45 plus shipping.

https://photos.smugmug.com/SYc-Site/...8AF111E-X2.jpg

https://photos.smugmug.com/SYc-Site/...E513310-X2.jpg

https://photos.smugmug.com/SYc-Site/...EF9E6CC-X2.jpg

https://photos.smugmug.com/SYc-Site/...E69C380-X2.jpg

https://photos.smugmug.com/SYc-Site/...8A5AAAC-X2.jpg

https://photos.smugmug.com/SYc-Site/...896241A-X2.jpg

https://photos.smugmug.com/SYc-Site/...5F0C034-X2.jpg

OK, how about $35.

Tony,
FWIW valve covers with the longer slot on the left top rail are designed for EGR equipped vehicles (73- and newer)
Finned SB valve covers-
Equal slots - no drippers - twist in oil cap - 69
Equal slots - drippers - twist in oil cap -70
Equal slots - drippers - push in oil cap - 71-72
unequal slots - drippers - twist in oil cap - 73-up

Thanks James. Price is now $30.