1 goes to turbo water cooling(inlet), outlet from turbo goes into expansion tank, 2 is just a bleed facility on the stat housing, the main stat housing(outlet) large pipe goes to the top of the main radiator, the other is the heater matrix supply, assume you are not using a matrix/heater then, if so need to also block off the head outlet under the inlet where the coolant temps sender for the ecu is, near dipstick.
tabetha