there´s only valve lash when a solid lifter cam is installed including the solid lifters. You should check if you have solid or hydraulic lifters as a first step.
That's odd - I swear I had to adjust the valves in my original '75 Dart 360 (back in the early '80s). Maybe my memory is faulty? Or are you saying that if I did, I had solid lifters, and that with hydraulic lifters I wouldn't have to adjust the valves? I haven't been inside an older engine in a long time...just in case it doesn't show. :) My last several cars were All imports with all the self-adjusting stuff.