2001 F150 5.4L 2V….leaking head gasket

Hello, I would find it highly unlikely that this engine would have an internal engine coolant leak caused by a head gasket failure. You may have an oil leak from a head gasket, externally. But internal leaks? Highly unlikely. Who is saying and what is your symptom and what testing has been performed? To answer also - no, I would not tear down a 275,000 mile engine with intent to replace the head gasket. Too much internal wear which would risk concerns reassembling. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops