My race car (not Z34) has fly-by-wire throttle with ITB's .... we set the ITB linkages up so they all move together with a single pull pink and connect the single pull link to a cable that is tugged with a stepper motor controlled by the MoTec ECU and a throttle pedal out of a Holden Commodore SS (same platform as current model Camaro).
The is what the Nissan V8 Supercar engine has (Kelly Brothers MotorSport to become Nissan MotorSPort Ausatralia on 1st Jan 2013).
Pictures of VK56 race engine to go into the Altima V8 SUperCar race car found here ...
Nissan Motorsport Reveals First 32-Valve Engine For V8 Supercars | Reviews | Prices | Australian specifications