The last 10:71 super charged street hemi motor I built and dyno tested made 924 HP at 7300 RPM with 7.0 Lbs. of boost, we swapped the pulleys to go from 13% under driven to 12% over driven which ended up making 12.0 Lbs. at 6500 RPM and 1027 HP before going into detonation
That was not quite doubling the pressure by over driving that 10:71, the manifold inlet temps go up any time you compress air more, hot air expands also so the resistance to the rotors compressing air goes up also robbing power from the motor to drive the super charger
I remember one of the NHRA T.V. announcers commenting several years ago that the top fuel blowers take over a 1000 HP to drive them