Cast 273 rockers or factory steel rockers budget 360?

you can get 3/8 24 thread 5/16 cup from rocker arm unlimited they also have 3/8 ball and 7/16 thread 3/8 ball (bigger is better)
don't ask how I just misspelled bigger but it's a nearby key
for worn threads or if you want to slide the ball over for 1.6 ratio
I think b3 also has them, hughes I think Smith brothers