how much to relpace head gasket on 1998 Ford Taurus

can hear air leak by dip stick, checked the exhaust gasket, no issues. I am not leaking water into the oil, nor oil inbto the water, does not run hot either, it is a 98 with 126000 on it, other than that issue ther car is in fantastic shape

Asked by for the 1998 Ford Taurus