A colder heat range plug, especially on pump gas, can and will make the difference in pinging or not
Ignition timing, jetting, compression ratio, camshaft, altitude and fuel quality all play a BIG part in how soon the motor will go into pinging or detonation also
Aluminum heads allow more compression than iron heads do also
Hemi motors with the spark plug located in the center of the combustion chamber make a small difference also
A SB Chevy with iron heads at Lake Mead will detonate a lot sooner with every else thing being the same the same as a iron headed hemi motor on the same day with the same fuel
As far as your motor on 92 octane non ethanol pump swill try 34 degrees total timing in Las Vegas to start with using Champion RC9YC or Autolite # 3923 and then go drive it