Spark Plug Heat range

Currently have a 360 that has a few mods. Pistons are KB107's for heads 340 Xers and the 292 mopar cam. I have the rn12yc champions in the motor. Sometimes in hot weather or warm dry weather it pings even with 92 pump octane. This is the newer fuel we have. I have tried lately 91 non ethanol gas with a bottle of octane booster from stp. This helps. But my question is would rc9y3 spark plugs be a better choice? To alleviate detonation or ping I get.