As far as the stock rockers are conserded, they will do just fine on a normal rebuilt engine. You want to look at the area where the valve stem hits the rocker, if its grooved or worn any, replace it. The worn patch will act like a grinder on the valve stem head and the softer of the two will wear down.
Also check the push rod end for wear, the push rod will dig in into the arm. Any of the aftermarket stamped rockers will work fine, E-bay had some stock GM ones not long ago.
Joe
