It was a wonderful little bike in its day. I had a CB350F and I had more fun on that bike. I could start it with my hand on the kickstarter.
But if it's been sitting for 20 years, it's probably not worth fixing just to have a bike to ride. You would spend more on it than it's really worth. A restoration project like that is for a collector. If you just want a motorcycle, you'd be better off buying something newer and running.