Rodeoowner replied:

Elwyn. I don't have any info on the Gas Research carby, but have converted my V6 to dual fuel. I believe the Gas Research carby is for LPG only? If you were thinking of dual fuel, think real hard! Mine is the factory approved (Holden put it on when I purchased the vehicle) IMPCO unit. If I turn the ignition off, and back on again within 5 minutes it backfires through the aircleaner. I bought it when I was in Sydney and gas was cheap. Now I live in Tassie. I get 6km per litre on Petrol (constantly fully loaded) and 4km per litre on gas. Petrol = 89c per liter, LPG 59c per litre. Doing 30K per year, no savings whatsoever. Bugger!