if i was still in perth i would give you a helping hand and am sure a few people in perth could. sounds like just a head gasket would do the job. The only place i can think of is riccadello motors in highgate (used to work there), it was a shell but i dont know if it is still going. basil the owner is a very good mechanic and have quite alot of good people there but dont know what sort of price you'd be lookning at but you could just give them a call to find out