When overhauling the cylinder-head/valve train assembly, replacing as many of the wear items as possible with new parts will simplify the reassembly and subsequent adjustments required to set up the valve-timing and clearances correctly.
Check also the valve guides for wear? The most common cause for smoke from the exhaust on start-up. If the head has to be removed consider using new cylinder-head bolts when reassembling as the old ones naturally "stretch" when torqued down.
Performance will be returned to factory-fresh levels and the engine will run more smoothly and with less mechanical top-end "chatter".
Other related items you may wish to consider:
Recommended pro-workshop gasket sealant: 08C70K0234M. Add as many items as you wish to the same shopping cart, new bolts 0910307001 stem oil seals 0928904002 adjuster 1283448G00 & cushion 1281434200 for example, and still only pay the same fixed price shipping cost. Please note this component may also fit other types of Suzuki models, and may have other applications.