Don't know if this will help you but my Indy tunnel Ram for a 440 has 12 bolts holding the top plate on. If you need some pictures let me know.

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