Big Block Rocker Shaft Shims

Those look good. I would not use needle bearing rockers. Too much small stuff to come apart with a failure, plus, the bronze bushed rockers have more surface area for better support for the rocker. There are no real power benefits to speak of with a roller rocker, but they offer fantastic valve guide and stem wear resistance. I would imagine you can see the difference on a dyno, but IMO you'd never feel the difference. But to me, if you can spring for them, they are great addition to help keep wear down and that's always a good thAng.