Left-arm spinner Shane Devoy did the early damage, but ACT Comets coach Mark Higgs has called on his entire bowling attack to pitch in and secure a valuable outright victory against South Australia.
The Comets need another six wickets while the Redbacks require 157 runs for victory on the final day of their Futures League match at Queanbeyan's Freebody Oval on Thursday.
Devoy (3-30) dismantled South Australia's top order, the visitors resuming their second innings at 4-130 after the Comets were bowled out for 227 on Wednesday.
Opener Matt Gawthrop top-scored with 73 and Michael Spaseski chipped in with a well-made 54, while left-arm quick James Munting finished with the impressive figures of 4-42.
The Comets amassed a handy 60-run lead after the first innings as they look to move alongside Tasmania on the top of the competition table.
Higgs had wanted to set a target of at least 300, but remained confident his bowlers could do the job.
''We were probably hoping for a few more runs and hoping to bowl a bit better as well, but we're right in the game,'' Higgs said.
''The pitch is deteriorating still.
''For us, it's about getting more balls in the right areas and pouring a bit of pressure, not just expecting it to come.''
Devoy came into the team only when Higgs was a late scratching, but the 23-year-old took his chance with a skilful display on a turning deck.
''I think he bowled fantastic for a period of eight or nine overs. He probably let it slip at the end,'' Higgs said.
''Saying that, he probably had young [Alex] Ross out LBW, he was a bit unlucky there I thought.
''He bowled really well, just got a bit carried away, tried a few things towards the end of the day and that was the only reason he got taken off.
''He'll play a massive part.
''All our bowlers need to play their part, whether you're taking the wickets or building the pressure at one end … that's how four-day games are won.''
AT A GLANCE
Futures League stumps on day three: ACT COMETS 267 and 227 v SOUTH AUSTRALIA 207 and 4-130 at Freebody Oval, Queanbeyan. The final day's play starts at 10.30am on Thursday.