Argentina - Amount of time to transfer between EZE and AEP

I have a flight on TACA coming into EZE at 4:53 pm. I have a very tight schedule and am wondering about transferring to AEP to fly on Aerolineas at 11:25 PM to go to Rio Gallegos. How much time would you recommend allowing between arrival in EZE and flying from AEP? Is this a good idea or simply too risky and better that I sacrifice a day and fly out the following day?
Any advice is much appreciated!

Assuming your incoming flight is on time 6.5 hours is more than enough time to make the connection. If it's a weekday there will be a lot of traffic around at that time of day but it still shouldn't take more than 1.5 hours max to transfer in a taxi between the airports