If you need more flow, cp sells this mod for your type pump http://www.cpperformance.com/detail.aspx?ID=939
I have made this upgrade on a 509 560hp bbc for a buddy with the carter m61045. It works fine. You just swap out the valve body. Or you can use the M5901P which allows you to use your stock lines (the pump arm is not the same as a block mounted pump, so you cant use the whole pump) http://store.summitracing.com/defaul...h.asp&N=400415
If you buy the carter BBC pumps make sure they have six screws holding them together round the edge. I think they all do.
CP's mod looks very much like the m61045 pump valve body.