Hello, You may want to call Steve Tanzi at Erson Cams and ask him if he has any rebuilt roller rockers for your application. He is wonderful to deal with.
If you tell him you read about this on the FE forum you will probably get them for about half price. Make sure you specify if you are using Cast Iron or Edelbrock heads and they will ship assembled correctly for your application. Robb McMackin is the guy who developed these for Erson and is a great person to talk to as well.
(775) 882-1622

Thanks, josh