HP estimate with Explorer 5.0 and upgrades

[tcf26]

I know the Stock Explorer is supposed to have 225 horses, but what would you estimate it to be with proper headers, dual exhaust, e303 cam and Mustang wiring and A9P or A9L computer? Just wondering what I will be looking at for horespower and torque. Ballpark figure?? Has the Gt-40 heads not the gt-40 p's this is a 96 explorer engine and the 65 mm Throttle body as well.