Cory Bernardi's Australian Conservatives party has announced it will contest more than two-thirds of the Lower House seats at South Australia's March election.

The party currently has two Upper House MPs in State Parliament, who were elected under the Family First banner but last year merged with the Australian Conservatives.

The Conservatives — who became a party after Senator Bernardi's defection from the federal Liberals a year ago — will field 33 Lower House candidates out of a possible 47, the same as the number of SA Best candidates unveiled so far.

The state leader of the party, Dennis Hood, said the merger of Family First and the Conservatives had delivered results.

"Since the amalgamation, our membership has increased substantially, our donations are tracking well," Mr Hood said.

Mr Hood sits in the Upper House alongside his colleague Robert Brokenshire who, like Senator Bernardi, was once a Liberal MP.

'Quietly confident' of Upper House success

The candidates include Senator Bernardi's chief of staff Rikki Lambert, who was suspended from Family First in 2013 for leaking ABC salary details.

Rikki Lambert is chief of staff to Cory Bernardi. ( Supplied )

Despite the high number, it is fewer than the 42 Lower House candidates Family First ran at the 2014 election.

Senator Bernardi was not on hand for the announcement in Adelaide today, because Federal Parliament is sitting.

Mr Brokenshire is running for re-election this year and, despite increased competition from SA Best, Mr Hood said he was confident his colleague would be returned to office.

"We're quietly confident that Rob will be returned and the reason for that is the polling suggests that he will be," he said.

Line up includes ex-Family First candidates

Mr Brokenshire said he was not taking his election chances for granted, but talked up the credentials of the party's Lower House candidates, particularly in regional areas, some of whom also contested the 2014 SA election for Family First.

Mr Brokenshire said they included farmers and business people respected in their communities.

"Richard Bateman [comes from] a third-generation farming family and fishing family, highly respected in MacKillop," Mr Brokenshire said.

"We have Rebecca Hewett who comes from a seventh-generation family in Narungga and Rebecca has a high profile over there.

"In the Chaffey area, where there'll also be a pretty significant fight politically — we'll have Trevor Scott who for 16 years … has been the breakfast presenter for the local commercial radio station."