I doubt it will need to be re engineered as an ICV.
I am only guessing here, but would have thought that it would only need to be inspected by TAC for approval with larger motor, and with Peter fitting a different rear axle assy, that will need to be approved aswell.
This is the CR on Datsun Z body, retains the original turrent/roof.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.