350 was an engine option in HQ model..... Rego doesn't discriminate between passenger and commercial, only that the vehicle is a HQ. As long as the other components are the same as came with a 350 ie brakes, springs, diff etc. You can drop a 350 into a HT/HG ute or van, a 327 into a HK ute or van without engineering it.
Had a mate in Gympie bought a HQ tonner specifically so he could drop a 350 into it without having to engineer it.
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