Me thinks 280 with Kohli, Rahane, Bharat (yes I said Bharat!), Jadeja and Thakur is very much doable. Caught a few minutes of the final session of Day 4 live and I don't see any demons at all in that Oval pitch.
The team batted positively in the 2nd innings and have set themselves up pretty well. Its ok if they lose, but they should go for the win. Pant is missed, but there are loads of folks who can be aggressive. In fact if Kohli and Rahane start Day 5 well and then a wicket falls, I would even be tempted to send a Shami or an Umesh just to go out there and have a wild whack. It can unsettle Australia and give the rest of the batsmen, especially Bharat some breather and extra confidence. He has a triple century in First-Class cricket and is a hardened batter in FC (90 games). His batting failures so far are mostly likely due to nervousness/anxiety. Expecting him to come good. Wish they had Ashwin in this game. His batting would've been invaluable.