Renault, you might want to read the AARCMAC rules. If you want to compete in the Pullstart class of a state or national title you cant use the OS TG motor as it isnt a pullstart motor. I think QLD are the only state running the OS TG motor in the Interclub and club meets at the moment....I could be wrong.

4.2 All cars must be commercially available and sold as 1/10 200mm pull start chassis kits
4.3 Any 2.11cc (0.12 Cu In) commercially available after-market pull start engine (i.e. sold
specifically as a pull start engine, examples - RB, OS & Nova Rossi), or up to 3.0 cc (0.18 Cu
In) KIT/RTR pull start engines.

Cheers
Adrian