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I'm guessing it's a 6, because you have used an AU XR8 snorkel.
IMO, you would be better going blown, as you get better driveability, better economy (if you drive normally), and it's cheaper for the power.
CAPA Sell complete supercharger kits for Falcons, www.capa.com.au
they have prices on their site.
There is a 10-sec EL Ghia 6cyl on www.fullboost.com.au
- although he has spent lots more than 10 Grand, that is a good example of a turbo EL.
EL Ghia's come with the XR6 motor and LSD, which is a good start. There isn't much that can be done to the BTR box, but they are fairly strong. A big front mount trans cooler is a must, and a shift kit would be a benefit, and help the trans last longer.
Hope this helps a bit