When overhauling the cylinder head assembly, replacing as many of the wear items as possible will simplify the reassembly and subsequent adjustments required to set up the valve gear correctly. The most vital items include valve guides, valves and valve springs. Check the working surfaces of the cam-shaft lobes for wear and/or pitting. renew if either of the aforementioned problems are present.
Other related components you may wish to consider:
Add as many components as you wish to the same shopping cart, new valve stem seals 12209ML072212208ML0721 cam-drive gear trains 14410MT400014420MT4000 (these are getting scarce, don't miss out!) & valve cotters 14781ML0720 for example, and still only pay the same single fixed price shipping cost.
This component may have other, sometimes unrelated applications within the Honda model range, so please always check by the part-number rather than the description prior to ordering.
Pro-workshop gasket sealant 08C70K0234M - easy to use with excellent results.