Tom Hemphill in Pa can tell you exactly how far you can push that block. He may even be able to point you in a direction towards an aftermarket block.

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