71 Valiant SL6 turbo questions
On an OEM T3 there are four lines - two coolant (in and out) , a threaded oil inlet port and a flanged oil drain.
You can use the heater hose circuit to feed water to the coolant hoses. HOwever, you don't need it if you let the engine/turbo cool down after running.
You do need an oil feed from the oil pump and drain line to the oil pan.