2000 Mustang value (blown head gasket)

I have a 2000 V6 convertible mustang with a blown head gasket and starts overheating while driving. Was planning on selling/trading in the car this year anyway (have had for 10 years)- and with the cost to fix am thinking of selling now. Any idea how much car might be worth as is? Car has 160k miles- body/interior are still in good shape. Could use some minor repairs (brake pads, few new tires). The garage I brought it too said they'd make me an offer (probably a low-ball) and need to stop in there today/tomorrow but just looking for feedback on what car is worth (ballpark). Ran blue book and been searching online but not sure how much head gasket would realistically reduce what I could get for it.