Mine cost $3500 limp in, skid out.
That was, stock series 1 RB25det, new radiator and hoses, stock series 1 RB25DET ECU, new oil/filter/coolant/spark plugs.
We re-used my good coil packs
Engine was $1500 to buy from a wrecker with 3 months warranty.
ECU was $200
Radiator and hoses was about $200
oil/filter/coolant/plugs was say another $100
So about $1500 for a workshop do do it all.
If you're in Brisbane you can have a drive.