The patina makes it worth more, right?
The forks are from a 2002-2003 Honda CBR954RR. Didn't come with the bike. I also own a CBR954RR and have spare parts. I've wanted to put a modern upside down fork on a CB Four for a while and finally found a bike to do it to. Direct bolt on. Just needs the stock steering stop cut off and new tabs welded on the side of the frame. I used to have a CB1100F with CBR900RR forks. They were cool, but were still standard forks. The USD forks just look beefy.
The only down side is that it will lose about 30 degrees of steering with the stock tank.
One bike is going to be a stock budget build. Basically some sandblasting, spray paint, bearings, and seals. The other bike is going to be custom. Only CB350F parts will be the tank, seat (maybe), and frame.