super c spark plugs

wondering if anyone knows the proper original spark-plug used on the super c (123) engine. I am restoring mine and it currently has autolites in it, I am fairly sure they were champions ? Just looking for the proper manufacture and number. All charts that I have found only indicate the gap. Thanks in adavance for your help !
 
If you need a hotter plug, you can use D-21. Normal heat was D-15. Normal Autolight would be a 386, or hot go to 3116
 

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