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

Where did you have it dynoed? My old boss and myself have always had good results from R&R Performance in spring lake park.
Over 10 yrs ago we took a 512, edelbrock heads, I believe 238 @ 50 hydraulic roller cam, performer rpm, 750 demon carb. It made 538 hp and 624 ft lbs. Granny could drive to get groceries. That was a very nice running street motor.