Alright looking at an 89 Turbo II RX-7, the man told me he doesnt know why, but once you hit about 85mph the car starts to run hott?! Does anyone have any ideas on some components that could be replaced to keep the car cool? Or should I just dodge this car and look for another?

Try pulling the thermostat for a couple runs. If its still over heating get a new thermostat. I would recomend a 160deg one I put one in my NA long ago and it ran so much better. Get a new O ring too they are cheap and yours is probably due to be replaced.