The engine should not need over hauling at this mileage.
Just do a compression test and fix anything it shows.
For tuning, just do a major service, and include new needles and needle jets. Check teh diaphragms carefully, renew -BOTH- if in any doubt. ( otherwise you will have synchronisation/vibration issues)
given that you want to fix your oil eaks, and will be removing the heads anyway. Check the condition of the valves and seats, replace teh valve springs anyway. Also check the valve guides for wear.
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