In the early 90's we ran this 499ci in our 69' Barracuda....
4.375 x 4.150 RB 6.76 BME rods 11.8 static (IIRC) 620 solid 906 heads (ported by my brother) M1 intake (gasket match) 1050 (9375)
727 footbrake 9in J SS springs w/inboard kit 4.56
At 3380# it ran 10.03 @135+ first time out. We only raced that combination once because we changed it over to 440-1s and a roller.....but, it was street driven constantly.
I would be surprised if even an Edelbrock RPM head, ported correctly, with the proper roller cam, couldn't approach 700hp at 500ci in a well thought out build.