Williams has made two changes from the side that beat Samoa 38-3 last Friday, reinstating Dan Parks at fly-half and replacing the injured Chris Paterson with Hugo Southwell at full-back.

The Wallabies made four changes - three of them injury-enforced - from the starting side that pushed England so close in the World Cup final, but Williams knows what challenges lie ahead.

You have got one of the finalists from the World Cup, one of the top-ranked teams in the world and it is a very tough job for any team, said Williams.

Certainly with the number of injuries we have at present and the lack of experience in the back line, especially with Chris Paterson out, its a massive task for us.

But its not something we are running away from. We will really enjoy it - to take on the Wallabies is very good for this team.

Parks, who was born in Sydney, was among the replacements for the Samoa game but his kicking form in training has been enough to hold off the challenge from Gordon Ross and he will start under the roof at Melbournes Telstra Dome.

Edinburghs Southwell made his Test debut from the bench last Friday after Paterson suffered an horric triple fracture of the cheekbone.

The 24-year-old slots into the starting line-up, with centre Graeme Morrison rewarded for his outstanding display against the NSW Waratahs with promotion into the 22-man Test squad for the first time in his career.

Scotland have not beaten Australia since 1982 and their last meeting was in the World Cup quarter-final last year when the Wallabies were forced to battle hard early before prevailing 33-16.

Scotland team to play Australia: H Southwell; S Lamont, B Hinshelwood, A Henderson, S Webster; D Parks, C Cusiter; T Smith, G Bulloch, B Douglas, S Grimes, S Murray (captain), J White, D MacFadyen, A Hogg.

Replacements: S Scott, C Smith, I Fullarton, J Petrie, M Blair, G Ross, G Morrison.