Ditch the OEM and put in a Pimp from Stinger.
https://www.stinger-performance.com/universalparts.html
It is MegaSquirt based, replaces the OEM computer using the OEM connector with some minor re-pinning, and will do anything you can imagine. EXCELLENT support by Stinger. I just put one in my 85.5 SVO (turbo 2.3) and it was almost trivial. It will also autotune the fuel maps if you have a wideband O2 sensor. Stinger will supply a base map to get it running, autotune with some manual adjustments after that.