[Captainfab]

I wouldn't think there would be any clearance issues running self aligning rockers with those springs on the Summit heads. Just stamped steel self aligning rockers should be just fine for what you are building. The narrow versus wide is pertaining to whether you will be using centerbolt valve covers or perimeter bolt valve covers. The centerbolt valve covers require a narrow rocker which I believe the stamped rockers qualify as. That is what was run on the L31 Vortec 350's.