Police motors have published horsepower ratings?

I always thought the Police Pursuit Mopars had a better cam, and all came with some sort 4 barrel carburetor. BUT that too, I also think they had different axle gearing then "civilian" cars of the same brand and type....just to make them that much faster and use more of the torque the engine produced on take-off, then the horsepower as civilians used for take-off.

Maybe I'm wrong, but would make sense, as just how the hell do the police "catch" ya when your already flyin' from a dead stop/launch?