My Mopar E Body is a 1970 340 'Cuda 4 speed pistol grip. I have owned the car since 1976 when I bought it at 17. It has not run in almost 20 years, going to try and get it running soon. I am going to drain and change all the fluids, install new plug wires, convert front drums to old parts car Kelsey Hayes floating caliper disc units. My question is: I ran the car for a couple thousand miles that 20 years ago with rocker arms installed wrong, switched right to left. "Ticking" tipped me off, oil holes in wrong locations. The car did run OK when I corrected my mistake. But is it likely I permanently damaged the valve train and rocker assemblies?