273 rocker arm adjustment
A) Find out where the metal chips are coming from!
B) Don't do the adjustment hot. It does not matter with hydraulic lifters.
C) Don't worry about the ignition timing.
D) Use the Mopar chart for which valves to adjust, in what order.
E) "0" lash sounds wrong. Loosen the adjuster. Tighten just until the pushrod has no free play. Should go about 3/4 to 1 full turn tighter after that for the proper pre-load.