Which power adder for this SBC Engine?

[HLSASS]

I currently am running a nitrous system on this engine and have had it with filling up the bottles, leaks, etc. I would like to convert the engine to either twin turbo setup or or supercharger. Although it looks nice to package it all under the hood, I'm a little nostalgic for a roots sticking out of the hood. Could someone help me with what I'd need to change on the engine to put 650-700HPHP to the flywheel? I currently put out 500 HP at the flywheel at 6000 RPM and with the juice, it pushes 650 but I'd like to do it without the juice. I appreciate the help!

10.5:1 compression
Stroked/Bored .30 350 block to 385
Holley 750 Carb
Edelbrock Victor Jr. Intake 2975
Dart Heads
Cold Fusion 150 HP Nitrous System
SCAT 4340 3.750 Crank
SCAT Rods
Splayed Caps
SRP-138094 Pistons
Erson-919314 Solid Roller Lifters
R-276-500 282-400 R110 Cam