Haulmark, Renegade, Show Hauler, etc (basically all the class 8 chassis tractor types, like mine) have 450hp as the base engine & go to 650hp or more if you like. This is true regardless of the Chassis manufacture, i.e.: Freightliner, Volvo, International, P-Built etc.
only in the last couple of years have they started moving away from the 12 or 13 speed Smart/Auto Shifts and started installing the 6 speed Allison (torque converter) autos - I prefer the 12 or 13 speed smart shifts (no clutch pedal / dry clutch) over any torque converter automatic.