Don’t take it to a dealership, chances are half the guys there were still riding their Big Wheel trikes when that bike was common, a number of standard practices have changed since then, and treating it like a current bike will only turn it into so much scrap metal. (can you tell I’m bitter?)
The best thing to do is find an independant mechanic who specializes in older bikes, failing that, just an independant mechanic (since he’s less likely to see the newer models that are still going to dealerships for service, most his time will be spent on bikes on older bikes anyways). If you have a local forum, I’d ask on there where people like to take their older bikes.
If you’ve got no other choice, bring it to a kawi dealer and ask specifically that the mechanic most experienced with older bikes deal with it.
Of course, if you can absorb the $650, one option is to view it as a learning experience to do a lot of bike work yourself. Get a clymer’s manual for it, put the salvage yard on speed dial, and dive in. If I had the time and space, I’d love to do exactly that with an old air cooled twin.
“The two seconds between ‘Oh S**!’ and the crash isn’t a lot of practice time.”