Actually the kit says 5-800HP from what I saw on the link. The complete engine says that it will handle 1100HP or something like that, but I just dont see it making that much. I have never seen or heard of a banks engine making anything even close to 1000HP, but then again, I have never heard of anyone buying one either so who knows. I am just not a big banks fan. I think that they are severely overpriced for the power output.
I totally agree on the stock block for that much power. Hell, I figure mine is a ticking time bomb at 700HP potential(if I ever get it setup right). I also think that some big Dart heads are a good choice as well. That is why I bought mine. They flow enough for 550-600HP NA so under boost the sky is the limit.