A fired-up Anthony Mundine said he was out to "kill" little-known opponent Darmel Castillo in their super-middleweight clash on the Gold Coast on Wednesday night.

Mundine will shape-up for the bout as the heaviest of favourites against the Panamanian who hasn't won a fight in over two years.

The clash is such a mis-match on paper that the NSW Boxing Authority last week refused to sanction the bout, forcing promoters to shift camp from Newcastle to the Gold Coast.

Castillo's last win came in June 2002 when he knocked out Costa Rican boxer Jose Venegas.

Despite the apparent bridge in class between the pair, Castillo refused to take a step backwards when challenged by Mundine in the pre-fight weigh-in.

Both fighters managed to get in a few mandatory shoves before security guards broke up the scuffle.

Castillo, who speaks with the aid of a translator, also managed to let a few choice words fly at the direction of his opponent.

"Tomorrow you retired," he told Mundine.

"Good bye. Down Mundine down."

Mundine, 29, said he would be at his best for the contest despite coming up against a boxer ranked more than 200 places below him.

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