I can't help with any first hand information............But..............I have done a lot of research on importing from the states to Australia.
Do your own research through the relevant govt departments relating to your particular situation. In doing so you will know for sure what is allowed and what isn't, this will help to sort through answers that may be misleading or just common knowledge.
try to find someone who has actually done this, (yes that is why this thread was created), and the importer who they used.
Over here, (Aus), there are several importers on new and old bikes but some of those are more into just making a sale than actually having a good to great service. The word SERVICE is the operative word that is lacking in a lot of these importers.
There is one importer who helps prospective buyers make the trip to the States, purchase the bike, they have a ride around for a period of time, (may go to Sturgis or what not, doesn't matter), then imports back here under the new owners name.
No taxes are applied on 30 year old bikes so a lot of money can be saved compared to newer bikes. Also because the owner has bought the bike and it is in his/her name this makes the import just a little easier. This information should be in your Govt regulations.
Even if you find an importer it is always good to find out for yourself as well.
