With the discoloration of the needle bearings and shaft. I would suspect 3 things.
Lubrication
Load
Too much spring pressure for the rocker make.
Did this have a stud girdle?
What springs, retainers & keepers are you using?
I would also recommend tack welding the guide plate after you set the proper geometry.
Ya need to mod the drain back holes.
A lot could have to do with the bearing itself and possible treating & clearance from the factory.
I have put roller rockers thru some severe use over the course of 40 plus years and most issues are at the tip end. And that over long term use.
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