Hot Rods SBC Engine "Ping"

We don't know if engine is stock 305 --- seller told us it as a good engine.

( Good oil pressure / idles smooth/ does not run hot. )

However, it has a ping. Even though timing adjusted, I just added middle grade gas to the tank.
???????? What steps should be taken to eliminate the ping?

 

crank back the timing a tad

 

Did the mid grade stop the ping?


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*Reduce ignition timing.
*Reduce compression.
*Increase octane.
*Reduce engine temperature.
*Reduce engine load.
*Delay upshifts to avoid lugging.
*De-carbonize pistons and combustion chambers.
*Richen fuel mixture.
*Make sure mechanical and vacuum advance are working properly and not sticking.
*Check EGR valve operation if equipped.

Feel free to try any or all of the above.