If it is a track only car you can easily cheat and just crack the throttle body stop or fab one since you won't car about the warm up or a slightly higher idle anyway.
Having Megasquirted my KA with a friend I can tell you that the IACV's on a KA are a pain. What are your exact goals for the MS ecu? Is this a daily or track only? Fuel only? Spark Timing? Coil on Plug? Just to run?
I'll help you as best I can from what I remember.
I can tell you that for the KA I found it easiest to pull off the intake manifold and remove the accessory valve and the idle air control valve to replace them with a GM stepper type, which I got running, but eventually just removed for a throttle stop. But this will depend on your car.