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.