Make a few calls to possibly Indy, Best Machine, Bob George Racing, and any other shops you can think of. Who knows what they have on stock and willing to part with

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