You have a realistic goal. If I calculate your goal per CI, and multiply it by my 512 cubes, it would put me at 653. I'm at 646 and didn't go too radical on the cam, and have about 0.6 less on compression ratio than you.
My combination:
512 cubic inches, 10.6 CR
Mopar stage VI heads ported (this is where you will need to spend some money to get the HP)
View attachment 224271
Hughes solid flat tapper camshaft HTL5660BS3 with Hughes lifters and valve springs
Edelbrock Victor single plane intake
Quick Fuel 850 carb
Comp Cams Stainless Roller Tip Rockers (PN 1621-16) 1.5 ratio
Mancini block girdle
Melling HV oil pump
Milodon 7qt pan
FBO ignition system
It dynoed at 646 HP 677 torque and idled at 800 without issue....could probably go a little lower. The vacuum is too low to run power brakes with that cam. I haven't dropped it into the car yet, so I can't tell you it's street manners.