If it was me for that combo I would go with Harland Sharp rockers and I would be on the look out for a 10% off coupon for Summit.

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