Who's rockers are these?
Your right, no MP on these, they do have roller and adjuster oiling holes and they fit the shaft nice...better than stamped I suppose. Have not broken one yet but run pretty mellow springs.
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I wouldn't be afraid to run that rocker with spring loads as high as 280 on the seat and 650 or so over the nose as long as the geometry is correct.
That rocker is bushed, like they all should be. When needle bearings are used two things happen.
The body is made significantly weaker because the bearing/race is so damn big where the bushing used in the rocker you have is a nice, thin wall piece so the rocker arm body is much thicker, especially around the spring pocket.
And the roller bearing on a big (bigger than what is used on say a SBC shaft set up) shaft that is hollow presents its own issue. The engineering is over my head, but the upshot has something to do with how the needle carries the load and transmits that load to the shaft. IIRC, the surface of the shaft will actually wad up around the needle and again, IIRC the needle causes the shaft to get a slight indent at that same spot and then it's over.
I should have paid more attention when the guy was talking but I really didn't care as I don't run needle bearings on a reciprocating shaft unless that's the only option.
It was for the junk Chevy rocker system back in the day, and why Chrysler guys want to copy that junk today is beyond me.