Time and money permitting, I'd do the head gasket, replace vacuum hoses, replace coolant (the green stuff is ok but not optimal), replace the timing belt, and oil seals.... possibly the water pump. As S-mk3-B said, it's not just mileage you need to worry about, age exacts its own price on all these components.
If there are no warning signs with any of these components and you're just driving the car like a sane person, I'd simply keep an eye out for leaks and replace the vacuum hoses and be on my merry way.
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