Can Mace please recommend a workshop or garage that can give me the best results by tuning the motor for me?

If you run a pulley no larger then 12 psi then you we will be able to tune your car; http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/MEM613/SubProducts/MEM613  If your adament you wont to run a 14psi pulley then you will need a custom tune. PLease let us know where in Melbourne you are located so we can recommend someone close to you.