Honda-SOHC

Hi to all
i have been riding on and off since i was 16 but due to Mrs and kids i had to sell my last bike about 6 years ago. still have motocross bike though. the time has come to get on the road with 2 wheels again.
I have a 1976 CB400 four super sport that i am trying to get on the road. she was a none runner for about 16 years but now runs. just.
i intend to get her to a showroom standard eventually but will be happy just to get it running well and riding first so any help technically would be good or cheep parts would be better