When overhauling the engine, replacing as many of the wear items as possible will simplify the building process and subsequent adjustments required to set up the engine correctly. The most vital items include a sound crankshaft assembly.
This will improve performance, reduce oil consumption and help achieve a smooth, quiet running engine.
Other related components you may wish to consider:
Don't forget to order all the gaskets and seals required in one economical shipment. Try this pro-workshop gasket sealant, 08C70K0234M; to complete the job like a professional!