I have a 98 deville witch i think has a blown headgasket antifreeze comes out the overflow hose when the car is turned off. it overheats temp raises to 265. it would be fine on city streets but on the highway it will overheat. then when its parked it will boil over through the overflow hose. it has a new water pump thermostat hoses rebuilt the radiator the tensioner is fine fluid coming from the vent lines ok. also i found a 93-94 northstar will it fit my car thanks....:confused: