I have heard that 7psi will about double your power.
10psi therefore would be 1plus 10/7=2.43 times the power, less pumping losses I guess.
Lessee; 2.43 x250 (a lazy 5.9Magnum), =600hp, Badabing
7 pounds of boost wont double your power
Know a couple guys running the torque storm units, which will produce about that much boost( blower)
Gains seem to be more in the range of 125-150 horse.
One guy i know has one on a lightened bracket Duster
With a very mild/ near stock 360 it has run 11.70’s
Headers, gears, convertor, etc
