Trainer Merv Dellar is uncertain how far Corvara can progress, but says he will gain a better idea after she resumes from a short let up at Kalgoorlie on Sunday.
The four-year-old has been a revelation for Dellar this season and her return in the Magic Millions Race Series Handicap (1200m) will be keenly observed.
After racing in Perth for Simon Miller, Corvara has relished her new environment and boasts an unbeaten record in her maiden Kalgoorlie campaign.
The Ready’s Image mare won four straight races, capping a flawless preparation when she outgunned Carob by 1 ¼ lengths 49 days back.
Dellar said Corvara has been a welcome and satisfying addition to his stable, but says her return against career-best opposition will be a test.
“This is her first time in open company and I’m not sure what she is like in this grade,” Dellar said.
“This will be a good indication of where she is at because this is a race that has plenty of depth to it.
“I have my doubts she can measure up against the top sprinters and in a race like the Hannans Handicap.
“She might be better suited to a race like the Kambalda Cup where the opposition is not as hot.
“In a perfect world that could all change and we will have a better idea after the race on Sunday.”
Corvara, who drops 4 ½ kg, has drawn barrier three for Dan Staeck. The leading jockey has partnered the mare in her past two victories.
“Dan doesn’t often ride at 54kg, so that is a good sign of confidence,” Dellar said.
“Dan has a lot of faith in Corvara and believes we are on the right path with her.
“It will be a good test for her and I’m hopeful she can get through.”
Dellar will also saddle up General Groove. The seven-year-old, who carries 60kg with the claim of Kate Fitzgerald, will be out to end a 999 day losing sequence.
Moment Of Pride, one of three entrants for trainer, Peter Fernie, looks hard to beat.
Julio Santatelli