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we put a 350chev into my cousins lux its a fair bit of work and to do it ourselves cost him about 10g for box computer mounts prety much everything, his recently tubed and shortened his diff as they dont handle the power to well also be prepared to break lots of diffs and tailshafts
Hmmmm, the diffs are usually pretty tolerant man as lots of other cars (especially rotaries) utilize the hilux diff as an upgrade to handle substantial power increases, although u mentioned computer, so an injected 350 chev could be pushing the parcel on a standard diff I suppose

You got any links or pics of teh car and conversion ??? would be very interested to have a peek