Another barra into cortina question

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Thinking of starting a new project with an xr6 turbo into a cortina but has recently hit the skids as it looks like you can't fit a 4.0 turbo legally into a 1200kg car. According to the qld main roads website for a car over 1000 kg the turbo engine size multiplication is only 3 x the body weight.

I had originally thought as the later models came out with the big six you would have been able to get a turbo' done complianced
.

Has any one heard any different?