Most of the guys appear to be using these on bigger bore aftermarket blocks too so the larger valves and a .030 over 360 block may not play well together.

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