I was recently given an old Centurion bike from a friend cleaning out their garage. I have been looking around and have found a fair bit out about Centurion but most of the information seems to be for early 80s model year bikes. I managed to get a date code off of the SunTour derailer, a V-GTluxe, which says it had a manufacturing date of '73

The frame is pretty good, most of the paint is gone, and there is a little rust, but nothing bent, and still solid. Seems to be a hi-tensile steel. The BB is about shot unfortunately, but components are in great shape.

Can anybody tell me a little more about these earlier Centurions, and also what my best option is for dealing with the BB?

Thanks