My Engine is almost ready

Looks like I should have the Engine back for Dart within the next week or so. We are only waiting on the Cometic head gaskets now, then finish upper assembly and make push rods. The results or the additional head porting has paid off. My LA edelbrocks now push 278 CFM on his flow bench which should be conservative numbers, probably closer to 286 from many others benchs. Nicks flow bench has never netted equal numbers to others in direct comparison. With this info we were able to order the roller cam. The cam specs are .673 lift and 270 duration. There was much work done to the M1 Intake as it was installed out of the box b4, so it at least port matches now. We have also given this block a short fill to hopefully add some strength. Although it will not actually hit the Dyno what do you guys think a 640 hp small block will do in a 2340lbs ride?