Dyno tests results are dependent on many things like the lobe center on the cam, the actual weather conditions outside the dyno cell, the amount of tuning done on the dyno. I've seen motors pick up 50 HP and similar torque on the dyno from tuning the carb, igntion and cam timing
I don't finish the final tune up now until the motor is in the car BTW, less power in a stick car can be your friend, less tire spin