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I have a 5.0 with 2 Holley 350cfm carb on top of a Holley sniper high rise intake with a mildly aggressive cam. My issue is that my exhaust smells super rich and spark plugs show a rich burn. My carb it set to roughly stock setting. What else can I troubleshoot should I take a closer look at my timing? Someone told me my spark plugs and wires would be causing a weak spark. Would that cause this issue?
 

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What are your engine specs? Stroked, aluminum heads, bored over size???

I would guess if the engine is fairly stock (besides the cam you mentioned), running 2 350 cfm carbs may be why she is running rich :)
 

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Besides the cam it's all stock. Right now I have one carb basically tuned out of it running progressive linkage
 
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