They appear to be stock stamped steel rocker arms with screw in studs and push rod retainers. We adjusted the rockers with the engine warm and at idle, we backed off the nut until the rocker started clicking, then tightened the nut down 1/2 turn. If that is not the correct procedure, then I need to find the torque spec and proper procedure. The engine block is the original numbers matching 389, the heads are cast iron from a 69 400. The number cast on the center exhaust ports appears to be 48 but the 8 is hard to distinguish on both heads.
When I bought the car in Aug 15 it had chrome Edelbrock V covers and they are fairly tall. The after market valve covers I ordered for a '65 389, were a lower profile and at the time didn't realize the heads had been changed. They gave it the stock appearance I wanted. But now I'm going back to the Edelbrock to see if the noise goes away... I bet it will. Thanks for your input!