It would be safe to say, that with the ignition set up right, and hydraulic cam it is probably putting out 170 Kw at 5000 rpm and 3000 Nm of torque at a dead flat curve starting around at 1500 rpm and going up to 3500 rpm.

Where did I get the info ? Looking at a dyno sheet graph printout on a 383 in a 1979 Camaro lt with 2.4 (?) gears, and the cast iron smogger heads. Which goes to show 383's work good on the street with thier ability to pump out the torque at street driven rev range of the motor.

Your engine may not be exact but it will be pretty close in power output.