I'm not sure why you would want to go turbo to NA, but to each his own. so, the ECU wiring is basically the same (same plugs/ECU config) but you may have issues with the o2 sensor wiring.
I can't remember for sure, but I think your turbo car has the Zirconia sensor, and the 86 has the smaller titania sensor (I think). My 87NA2T was able to utilize the same 84 zirconia when I did mine. depending on yours, you may have to do some small wiring changes in the ECU plug if the sensors are different. There is some good info on this over at XenonZcar.com Z31 Fuel Injector Differences, ECU and O2 sensor and Interchange Information
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