383 needs more power

In October’s I purchased a 1971 Duster with a 383 and 727 auto. In the spring I had the car dyno’d and it made 230hp/286ft lb at the wheels. I feel these numbers are lower than they should be. I have a 750 demon carb, Edelbrock dual plane RPM intake, headers, XE284H Comp Cam. Unsure of what heads are on it. Any ideas on what I can do to spruce it up a bit?
First post since 2018? Welcome to the site! I would try tuning what you have. I would start with this list:
  1. make sure throttle is coming open all the way
  2. check initial timing
  3. check total timing
  4. check compression
  5. make sure all cylinders are firing (yes, I've seen a dead plug wire)