I, myself am running Comp Cam roller rockers. The part number escapes me at the moment. I have had them a very long time now. Another place to seriously consider would be Hughes engines.

You may need new pushrods. I am currently unaware of a roller rocker that has a cup end. Length is also a issue. Hughes engines can rent you a tool to check pushrod length. They will deduct the rental price if you purchase new pushrods from them off the new pushrods.