Do a complete top end rebuild, to do the valve stem oil seals the head has to come off & the valves have to come out.
So while your at that stage check your valve seats (may need re-cutting) and you may as well do the piston/rings & barrel like Tom said, or at least have a look.
The valve seals come as part of the top end gasket kit that your going to need to do the job, you may need a new piston kit as well.
If the barrel is scored (scratched) you will need a re-bore & an oversize piston.
All up your looking around $300 plus a weekends work.
Mezo.
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