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I cant find my original thread,but i was having major backfiring at wide open throttle. I trouble shooted several suggestions but still have the problem.Even changed the Edelbrock 600 with a Holley 650. Now im thinking its the adjustable vacumm advance. Could anybody give me some idea how to adjust this as i've not done it before. I know it requires allen wrench into the module for adjusting, but thats all I know.
 

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I had backfire issues with a adjustable advance years ago, now i dont use one. Just set initial timming to 16 and put soft mech advance springs in and see if it goes away.
 
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