my 95 240sx has been overheating at idle for 3 days, then on friday night, i went to start the car. it took 10 minutes of the engine turning over before it started. when it finally did, i drove to the end of my street and the check engine light came on. dismisssing it as nothing, i pulled out onto the main road, and in my rear view mirror i saw the horror of smoke billowing out of my tail pipe. i qoucikly turned around, parked the car, and got onto these forums, i have concluded that the head gasket must be blown. the car has 153K Kilometers (around 80k miles), and i was looking for some advice or help replacing the head gasket. i have called 3 shops so far, one shop wants 900 to replace it, one shop is closed, and the third shop said due to the higher miles, they suggest replacing the whole motor. has anyone ever swapped out their head gasket, and if so what tools do i need and what advice or tips do you have? thanks!!