Carlisle won the league finishing on 86 points, and Leyton Orient made it into the final automatic spot with 81 points last season, so it's still very possible Swindon can make it into a top 3 place for the end of this season.
In other seasons the team in the final play off place seems to be on around 71 points, but that's only 2 wins and a draw away for Swindon out of 11 games.