Bobby those are pretty neat VC's. Original Ford aluminum stuff was cast mainly at the Sheffield foundry in Alabama. Ford also used Buddy Bar and Ansen for various cast alumimnum parts too. Weiand, Edelbrock, Offy, Shelby, Cal Custom and others all sold various aftermarket speed parts and often used the same foundry vendors. So special batch runs were pretty easy to have done with the molds already in house. I've seen a few of those PS covers before too. I like them. One of the rarest bloopers is the Weiand cast FE VC's where the Weiand logo is up side down. Quite a few sets slipped out like that. I've been looking for a set for years. LOL