273 Rockers on a 1971 340

ask Yellow Rose about the oil squirter for the adjuster ball
often overlooked
yr does not prefer but you can also oil your balls through the pushrod
there is a copy of one of yr's writeups on squirters ib the 318 cam stickie

if you increase the lift from stock the position of the rocker on the tip is about the same when on the seat but the position when open is further along the rocker shoe
"about the same" in the preceeding covers valve jobs, tip shortening etc
if the "stripe' has moved a lot you can shim the shafts and or try lash caps
now if you have installed long valves...
well if you went from .450 lift to .650 lift a .100 LONG Valve puts the closed tip/ closed tip angles back about where they should be and gives you room for springs to control your valvetrain
you may have gone to smaller stems too