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just be carefull of the laws
in nsw i have seen afew guys buy writen off cars at the auctions
by the time they get car running the engine is too old
the last of the ls1s are borederline of being able to be engineneered in nsw
now the laws might be changing but u need to research the laws now and even what they might be in the future

anyway if u use the factory wiring and dash wil make life easier in the end
a pain to strip and neaten at start but u can keep the factory immobiliser as
these are much better than most alarms out there
plus if u use the factory dash its a apin to fit and mould but wiring will be easier
especially with a ford v8 as the ford v8 quad cam has no tacho signal from ecu
the dash works on a canbus system