Nice engine.
As much as it may come off "wrong" to some folks I am going to have to agree with Brent here and say that those numbers are really, really strong for that mild a build. It's making 1.45 horsepower per cube, somewhere around 2.3 horsepower per cfm (using Blair's flow numbers), and about 1.33 pounds of torque per cubic inch.
All of these ARE achievable numbers - but not very common for any engine that by your description is on its first round of tuning. I rarely see that level of performance from any FE engine that just got assembled with a first effort cam selection, first go around with a set of new heads, first round of tuning on an EFI system, and non-optimized timing. Takes me quite a bit of work to approach that level using highly developed parts I have a lot of history with. The electric water pump is worth about a dozen horsepower in my testing.
The dyno data and videos do show some sort of anomaly that might be worth investigating. The inlet air temperature on the dyno screen shows 48 degrees F, which is pretty close to outside air in that area that week. Using weather data for that area, the correction factor may well have been at zero or 1% with those inputs. However the inlet air temperature on the snapshot of the data log from the FAST system shows 61 degrees F during a pull. That variance would give about a =/-2% variance in correction. They might have a sensor location or calibration issue. I assume that the data log is an early effort since it shows a 24% fuel correction and still very lean compared to your target (although the lean number is closer to what I run for best power...)
Account for the 2% and about a dozen for the water pump & you get into the 670s for power and 615ish torque at +/- 1.27/cube - - - still really strong numbers and closer to what I would expect to see from a well thought out build with very good parts.