What kind of horsepower to expect 383 build

The 19 year old combination, sounds like Direct Connection recommended recipe. ..
Yeah, I got the motor with the car. Someone followed the recipe for sure.
The chassis was laughable on that car. Super Stock springs moved inboard, and ladder bars welded solid to the rear. I had to run 8lbs of pressure in the slicks, and steer the car all the way down the track. Pretty scary ride. I found out later the relocated frame rails were about to break apart from bad welds. I'm lucky to be alive.