Is it expensive to set up?
What components do I need to buy to set it up properly?
How streetable is it? or is it race only?
How do I determine what components I need(size injectors.throttle boddies etc)
Racer is absolutly correct. If you are going to drive the car on the street it is useless. It's only good for racing.
I've heard of people setting up individual throttle bodies injection systems using Holdens Delco computer with great sucess (I've heard but never seen). All you would need to get is EFI webbers style throttle bodies & track down a holden V8 computer with the loom & sensors.
I think Holden sells it for $1100 new but if you track it down at the wreckers it would be much cheaper. You can then walk into any performace shop that specialises in holdens (just about every shop in Australia does) and ask them to tune it for you. The replacment parts are always available for them & the car still retains closed loop mode so when u cruise you get good fuel ecconomy. If you don't want to use holden parts in your car your other alternative would be to use Motech or Autronic but at $2500 + fitting & tuning as a starting price they are not cheap.