505 stroker fresh off the dyno - Power seems low? Thoughs?

Run it on another Dyno lol.

That may not be that crazy of an idea.
There could be some anomalies with the dyno room or exhaust system that are contributing to the low-ish output.
Plus, it would be nice if the dyno operator showed little more desire to troubleshoot the numbers a bit.

-Maybe the fuel is crap, and that’s why it wouldn’t take more timing.
-a compression test would have been nice
-maybe try a different setting on the valve lash

Unfortunately, without having a history for that dyno service, the numbers are kinda just numbers.

Have they tested any similar BBM combos that they could reference to see how your motor compared?

Was an air turbine(sensor) being used during testing?
Any other pages of data they gave you?
One that showed air flow and VE?