Oliver, just a heads up - I take the ACA-MEX route all the time. Expect that particular flight to be delayed on arrival to MEX by at least 30 minutes or more, a combo of arriving late, then being forced to circle waiting for a landing slot. It has been consistently bad enough that for my usual 6:15 connection to JFK, I take an earlier flight from ACA and just wait the time out in a lounge. Too many close calls.
You will be fine with a 8 pm connection, but I would just plan to hang in the airport...