Are both flights on LAN? Are you checking bags on one or both flights?

In any case it's not something I would feel comfortable doing (but I don't like to take risks when it comes to missing a flight). IF you are on time and IF there is no delay at Immigration and Customs you MIGHT make it in time. What happens if you don't? That is to say, what is your plan "B"?

If it were me I would arrive the day before. OR leave for IGR a day later.