Ayuh,.... Mine was a '72....No, a cleaner will not work at this stage, you will have to pull them. My first bike was a 1978 honda cb750. I still look at those bikes as new.
You're not going to find a shop that wants to take on that job.Yes carbs need rebuilt I live n south bend IN any one know where to take it
Motorcycle shops are pretty damned busy year round; most of them can't be bothered to take an old bike at almost any cost for anything but an oil change or tire change or something. When I've had old bikes I've had them turn me away pretty reliably (which just made me learn to do more stuff myself, so it worked out). Sometimes in the winter you'll get lucky because they're not as busy but I wouldn't hold my breath.Any motorcycle shop should so it. You may not want to pay the price to get them cleaned up though. Could exceed the value of that old of a bike pretty quick