[NASSTY]

miniboy1962,

your build start date is the date when you take delivery of your chassis and shell. An engineer will want to sight the invoice from the kit manufacturer which should show when delivery took place. Deposits for a kit are not taken as the start build date.
In Victoria, you are limited for engines by the fact that Euro3 started at 1/1/06. If you buy a kit then your engine will have to be a Euro3. However, just as Euro2 was introduced on 1/1/03 you may find that Vicroads gives a concession to ICV's (individually constructed vehicles) to allow for the fact that the emmission ADR keeps changing. My start build date was 2003. Vicroads gave a concession for ICVs started b4 1/1/05 to use pre Euro2 engines so long as the car was registered within 3 years. My Cobra must be registered this year 2006. Thus I'm able to use a 2002 AU Ford engine.To date, I have not heard Vicroads making a new concession for vehicles with a build date after 1/1/06 to use Euro2 engines. So at the moment you would have to use a BF Boss, not BA. To avoid being caught out you should buy your engine near the end of your build so you know what the rules are when you register your cobra. There is plenty else to do before you will need an engine.