I agree with the above comments although I don’t think you have a gouge or a hole, but the erase head does have corrosion on it and I see other evidence the machine was, at least for some period of time, in a damp environment. And yes the gummed up lifters say not well maintained. But the wear in the lifters looks average so I agree the heads probably have decent life in them, and the wear looks even (no keystoning or trapezoidal wear pattern). As always, you know nothing unless you have them professionally evaluated, and the value of the machine is in the heads. But hopefully you’ve gotten enough insight to help you make a decision.