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Thanks Mr.P , I just switched to a bigger 950 Holley carb, had a thremoquad on it before and it pinged like crazy. I should probably put new plugs in it and it check it then. Is the autolite 3924 a good plug to run . This is on my 493 with edelbrock performer RPM heads ?.I was thinking my timing is at 37 deg. total . Also running 110 octane. Thanks for the feedback

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That`s a hot plug for your combo in my opinion...........it`s like a #5 in NGK and the band you see on the ground may move closer to the middle of the ground strap if you go to a # 7............That plug looks hot and nasty. Try a 7, post a pic and see what happens.