Hi there, just chucking in a few ideas,
I know your insurance doesn't care about what mods are on the car (Your insurance company must be one of the elite few).
I don't know the specific laws and regulations for your state, but something like this would need to be engineered to be street legal.
Your insurance will have this caveat, so keep this in mind, as typically when something goes wrong (And it can be 110% NOT YOUR FAULT),
insurance companies will do their very best to make sure there is a way NOT to pay out.
Increasing the displacement from 3.6L to 6.0L, or 6.3L would definitely require an engineers cert in NSW. (Regardless how many cylinders are involved)
I have seen insurance companies be more than happy to take your money when things are good, and then turn in to complete assholes when things go bad.
To give you an example, a friend of mine had a Holden VB sedan, spent around 7K to get it resprayed, and re-chrome bumpers bits and pieces.
He spent another 5K re-trimming the interior to look stock.
The car was showroom condition, and was his parents FIRST car when they arrived in Australia in the 80s.
Next he stuck triple webbers on the thing.
It was something that he did over the weekend, and to fit the webbers he needed to remove the HVAC blower from the engine bay firewall.
(He was getting something custom made at the time to replace the blower motor).
They guy had told the insurance company that the motor was going to be bored out, have a stroker kit fitted, gear drives, cam, and some other major engine work, which was gong to commence at the start of the week.
The webber thing was him mucking around, just seeing what the engine would be like when things started happening.
The guy literally drove the car 50m to the nearest petrol station to get some fuel, when he was rear ended.
The accident was not his fault, (He was stationary), the other person admitted liability (Crazy), was speeding (showing off), and the chassis on my friends car was badly bent (stat write off).
Both cars were performance cars, and both JUST happened to be with the same insurance company.
My friend had his insurance revoked, because the car was found to be un-roadworthy (the blower motor was not fitted, which was an ADR requirement)... The other car was not covered either, because he didn't declare the rim sizes were increased beyond manufacturers recommendations.
Both drivers were out of pocket for many TENS of thousands of dollars, and they were left to fight it out in the courts amongst themselves.
What I am trying to say here is if there is something out there that can be bought stock, and the manufacturer has done ALL the hard work crash testing, ADRing, and compliance, and the insurance companies have premiums already calculated, and sorted, then I would strongly recommend getting a car that already has the base that you require, and work from there.
The hassle with engineering a car, and constantly trying to explain and prove the modifications have been properly done to an insurance company can be a nightmare and not worth it in itself....
