You know that there are two types, a left and right rocker?
Strip the rockers off the shaft, and clean them up. Find an area of the shaft which is not worn and feel the play in the rocker bushing. There will be some, but make a set where they are all the same. Bad ones are "outliers" in other words. If the shaft has worn spots at any point it will have to be replaced.
The tips can be re-surfaced by any good machine shop. Or you can carefully wipe the tip following the curve on a whetstone. Coarse then fine. There is no sense installing rockers with divots on the tip. You can't adjust the valves properly.
Check the adjuster balls are still round. Check them on the new pushrods. I've seem them get ridged in engines that didn't oil properly.
Make sure the oil passage pedestal gets matched with oil hole in the head when you reassemble.
That's it.