Thanks for the reply everyone, you guys are great!
I checked out all the websites, and I can see I won't have any shortage of parts or people over here. Made me feel a lot better about bringing a classic motorbike over. I'll be sure to contact every person and club you've mentioned this spring when I actually get the bike over here. Sounds like I'll find plenty of people to ride with. Never even seen another SOHC/4, always ridden with newer bikes, so it'll be cool if I can hook up with a club over here.
Tires are about 20% right now, and swingarm and rear wheel bushings are not necessarily bad, just the only bushings I haven't replaced as part of the restoration. I suppose a new set of high-mileage touring tires and new bushings would be a smart thing to have done before I leave since they'll have to get done at some point anyway. So far I've done all the work myself, and planning on bringing tools over as well, so should be in good shape for ongoing maintenance as long as I can get parts. I'm already over here in the Netherlands enjoying the beautiful winter weather (ha!), but I can have my father-in-law run the bike over to a shop back home before the spring rush to have it all set up for the trip.
Thanks again for all the help... can't wait to get my bike back!