Aluminum Roller Rockers questions

No needle bearing trunion here......if you spent more that the high 400.00's on them , take them back. Because you are close enough to a top line rocker to make the leap.
The shafts just have to be harder that the rocker to work.....I'd prefer a bronze bushing because it is harder than aluminum , but these will work in a moderate application.
If your spring pressure gets around 380-400 lbs. open , you might want to re-think your plan.
Hardened shafts and banana grooved to enhance rocker pivot oiling would be the direction I'd go if I were using these.