I'm not big on throwing horsepower numbers out there but my Sons stock crank 360 has gone a nice string of 6.54's in a 3200 pound car with a 727 and 4.10 gears. Edelbrock heads and a 610 lift roller cam. That should be a hair over 500 I would think.

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