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We are right hand drive in Australia (drive on the left side of the road)
The Australian 4.5L (TB45E) has a sticker with the timing info on the top the tappet cover (sometimes called rocker cover, or valve train cover) the sticker is towards the rear of the tappet cover around cylinder No5.
From memory, your TB45E timing marks should be 5-0-5-10-15 degrees, with Zero (top dead centre) a slightly longer mark.
You can always pull the dizzy cap off, and pull No 1 spark plug out, and find Top Dead Centre with a soft probe into the cylinder, once you have that, you can mark Zero Deg on the Crank Pulley with a white dot (or a mark thats easy to see)
You wont need to set the ECU or anything, just have the engine at normal running temp, confirm the idle is normal, if not check fo Vaccum leaks etc first.