OK here's a couple pics.   All these rockers shown were on the same shaft.  The shaft is new,  was part of a never fired rebuilt 312.  The rockers aren't rebushed,  maybe they were honed a little.   No looseness or wobble on the shaft on any of them.    I know Tim McMaster has a video of rebuilding rocker arms where he grinds them.   Don't know if he has a limit where he considers them junk.  

I don't know, but to me it sort of looks like they were hit with a wire wheel, not refaced. Those worn rocker tips are a good example of why using a flat feeler gauge to adjust the valve lash often provides innaccurate or inconsistent results. On the heads I rebuilt the rocker tips weren't so bad as those, but the rocker bores and rocker shafts were trashed, heavily scored and galled in spots due to poor oiling "back in the day". This is unfortunately common with as-found Y Blocks today. Were it me and I had to use them, reface them keeping the same radius.

Maybe you know this already, there is a place out in California that rebuilds them, Rocker Arm Specialties. The clearance between bores and shaft is spec'd @ 0.002" - 0.004" wear limit 0.007" ; this affects overall oil pressure.

I have a streak of stubbornness coupled with a dislike of re-installing defective parts. It takes just as much effort to remove, disassemble, clean everything up, reassemble and adjust everything with worn out parts as it does with new or serviceable parts so whenever possible I like to use new parts and make sure everything is according to Hoyle.

I found for example upon inspection just about every single pushrod was actually slightly bent or had excessive runout + the worn rockers and shafts. Slop and excess clearances in each valve have to be taken up first before that valve will begin to move. Too, everything slopping around means the valve rocker will never hit the same spot on the valve stem twice in row or have the same valve timing/lash. Depends on how picky you want to be and how much $$ you want to contribute to feeding your OCD like me.