help with subie ecu

[seangfy]

im in the middle of going subaru in my 73 super but ive came acrosse a delema im not sure what ecu to use i have a ej20 motor that was a twin turbo japanese lagacy engine but im converting it to single turbo not sure what ecu to use was planing on using a megasquirt system but thares a lot of tuning involved in that not sure if i can figure out all the software or to use a stock wrx ecu from a local wrecking yard but i dont know if it will work due to my engine being a japanese motor any help or info on this subject would be awsome thanks in advance