Nitrous and head cfm

I may be way off base, but Im thinking that
Nitrous can somewhat "go around " the notmally aspirated rules of head CFM and how much hp it will produce.
Example:
Say a 360 magnum @400 hp has a 200 shot of nitrous on it. The heads flow 220 CFM and will allow 450 horsepower. How much beyond 450 would the nitrous add, the heads being limited in flow ?? Theorhetically , of course