Good luck OP. That ECU isn't even supported by AEM anymore. I have one in my 88 GT with a proCharger, and I'm tossing it for a newer system (Pro-M) very soon. Honestly, I wouldn't bother with the AEM since you'll have a tough time finding anyone who will work with it. I know you paid a lot for it and might not have the funds for a newer system, but that is really your best course of action. look at Pro-M if it's a street car, and Holley if it's going to be a track car.
If you really must use it, Bob Kurgan
https://www.kurganmotorsports.com/kms/index.php may be able to help you as he sold and tuned the AEM for many years.