A question about Dyno2000

I have recently put data in the Dyno2000 program for my 318 and it says I am making about 388 flywheel HP!

The question I am trying to ask is: Does anyone have any experience using this software?
How accurate is this software?

I mean I have turned a best of 13.55 at 102 mph with a 3.91 sure grip and I still was not done tuning the carb.