I pref swap over rebuild, Mechanic here do not have proper tools and honda engines are useless for rebuild even if you want to rebuild the engine it will cost you more then 50k and there will be no guarantee how long it will work. I have recently swapped a sealed d15b in december 2015, the total cost was 36k (Sealed assemble, hose pipe, labour, oil air filter, engine oil, spark cables japnese). If you need any kind of help you can contact me.