You will need the pedal for the LS3. There have been a few wired throttle body conversions, but always check with the ECM to see what is required.
Usually the LS3 is DBW.
You'll need:
Headers
Fuel tank modification
Pump/regulator
Fittings
motor mounts
wiring harness for LS3
and a few other things I'm missing, but that's the gist of it.
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