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?