I've got a 292 in a 55 t-bird. Engine has less than 50k miles. I pulled the valve covers to set lash and found some of the rocker arms are not centered on the valve stems. They are off as much as 1/8" to 3/16". The ones that are off are too close to the mounting pedalstal. Is this normal? The engine is clean inside. There doesnt apear to be any excessive wear. It runs good. Are their left and right angled rockers and mine were put in wrong? Should I replace rocker arms? Should I install spacer washers between rocker arms and pedalstals? Should I set the lash and close it up?  Any help would be appreciated.