That rocker set is in really bad shape. With that much wear, I am with HRL that you are not going to be able to rebuild them in any proper sense. As for reconditioning, the outfits that rebuild these things generally machine down the shafts to get them even, then they are re-plated and build up with hard chrome. The rockers are all bored/honed out to a standard size, and the shafts are then machined again but to the appropriate size for the now resized rockers. Tips are reground in a fixture, adjuster balls replaced.
I have seen bushings used, press them in, drill the spit hole, machine the inside grove.
if you find a decent replacement set, save your pennies and have them professionally rebuilt. Rocker Arms Unlimited in California is one of the very few places that I know that does that kind of work. Not cheap but they can do what you cant with those rockers.
And yes, like HRL noted, before you install them, you need to fix the oiling issue, which is not an unusual issue for motors that have been around the block once or twice.
