if you really really really want the car it's up to you to buy it
1. its very likely it does have a blown head gasket
2. once fixed properly with correct torque settings it shouldn't blow again
3. its quite a costly job
4. get a full mechanical warranty... when it blows properly get it done under warranty
5. as soon as you get back from them take it to a mechanic and get it retorqed to 72ft lbs (engine cold of course)
6. hope the dealer did the job properly
7. enjoy owning a supra
