thats pretty good!
I am guessing at the same boost with a good set of cams and tuning
there is probably another 75-100hp not to mention cranking the boost up a little more would probably be cresting around 850
After the 272's and upgraded stock ecu (timing, rev limit) the car did 666whp at the same boost, running very rich up top and a wastegate spring that would not hold. It would of probably been around 680-700ish @27-28psi.