Hey thumper if you have the part number do a fast check on ebay and racingjunk. I've had lots of luck searching for unstocked parts on both of those sites. Amazon is also a go to place.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time