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I have the LS3 tuned with Dynatech LT headers, VMax PTB, CAI Inductions, Inc intake, Apex scoop and washer relocator, and NPP dual mode exhaust. It put down 424rwph/411rwtq.
I wouldn't do CNC heads. I you will only gain a few horsepower at a very high cost. One option I have thought about is an LS9 cam. It's good for around 20hp and compatible with FI. I would be sitting around 440-450rwph with stock lifters, spring, and pushrod
Another option is contacting GPI for their modified intake manifold and tune. I saw a thread a few months back where they were able to get ~435+rwph out of an LS3 with no internal work.
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2013 Camaro 1SS/RS - Ashen Gray Metallic
| LS3 | CAI Inductions, Inc Intake | Vmax Ported Throttle Body | Dynatech 1.875" Long Tube Headers | Apex Scoop & Washer Bottle Relocation | Lethal Racing Night Fury Cam | BTR 7.400" Push Rods |LS2 Dampener | Melling 10296 Oil Pump | IWIS Chain | BTR .660" Dual Valve Springs | BTR Trunion Upgrade Kit | Lethal Racing Tuned | Anvil Notch Spoiler | BMR Split Drop Springs | Eaton TrueTrac | GM 3.91 Gears | LPW Diff Cover | Rohana RF2 275/40 20x10F 315/35 20x11R | BMR Polyurethane Motor Mounts 
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