Headed to the Dyno. Any guesses?

Dynos are funny - while they satisfy the greatest desires in all of us, they can also be fickle and play games. Same thing with dyno operators. So it may be fine. Without other numbers it's hard to tell.
The reason I questioned the head numbers is "if" your heads were averagely ported you "should" have around 265-270cfm @ .500 lift (with peak flow at or very close to 300cfm @ .600"+). That "should" be enough to exceed 550 horsepower with that cam but you're 8% or so below that . The BSFCs tell you how efficiently it's running. If it needs a lot of fuel to make the numbers you have - you may have an issue in there. What is the peak efficiency on it?
The higher indicated oil pressure will remove horsepower. Lots more than you might think at peak rpm. Ring gaps and cylinder wall finish and cleanliness can remove power if they are not "right". Valvetrain geometry can remove power... As can a belt driven water pump, cam driven fuel pump, or use of chassis specific headers rather than big tube dyno headers...