i know when field made these units, that they came in different stages of setup (unlike jdm mines), maybe wrong here but i think the stage 1 setup was around 1.1 going through to around 1.4 on the more aggressive maps.
they are supposed to be very good units, but the only true way to find out what one you have is by dyno
set the initial boost to around 1.1 then see what fuelling and ignition is like, and gradually increase boost level untill you start to lean out, it maybe a 1.4 unit that you have there!
but when ive done your car it will need setting up anyway, with the goodies you will be running, so maybe thats the time to see what this unit is capable of achievieng.
or just flog it on and get your standard ecu mapped with h-dev (thats the route i would take tbh)