If it needs new valve guides, only have this work done by AN EXPERIENCED airhead mechanic/machinist (that means both!).
If you have the work done by a motorcycle mechanic, or one that was not trained by the factory during the time these bikes were manufactured, I would give you 50/50 odds of them screwing them up.
Being in Australia, I don't know who to recommend. At the very least, send check with Munich Motorcycles in Perth.
If you do ship them, double-box them, or you may end up with a broken fin. (DAMHIK)