Your shafts are really beyond repair. You can still find replacement shafts on occasion, the best option my be to find a complete replacement assembly.
I had a rocker assembly rebuilt at Rocker Arms Unlimited, the work was top notch. I thought it was a little pricey until I started pricing the parts separately. Having assembly rebuilt just seemed the best action.
The oil tube is restricted as to limit the amount of oil at the top end. The rocker assembly doesn't really require full flow.
https://www.rockerarms.com/
