you will need to change teh sump and pick up pipe as they differ

exhast manifold

id leave teh 4wd inlet on as its better than the 2wd

if going to run l8 ecu

you need to swap the 2 outa wires of the tps sensor if using a 2wd engine loom

whcih would be recommended as they plug up tottally different

only problem is if its a green top engine with lamda the 2wd loom doesnt have this in, so you will need to make a sub loom up for the lamda and run it into the ecu i think else it wont run rite

or you can wire in the 4wd complete loom and remove your 2wd

onkly difference really being is where it connects

yours is behind teh dash board and 4wd is behind battery

other than that simple swap