As much as you will be swayed by many on the dark side try to stay away from them ; It will only lead to s******s and a lot of back turning . Now the reality the land of OZ is getting harder and harder to get your car registered before doing anything, get guidance from your engineer . You need to make a decision on the engine you want to be using please dont commit to something that cant be registered. No matter what any one says most people will have no idea whats under the bonnet.. Id hate to say it but the LS1 idea is actually the most simplest but it will come with a certain amount of pain.