Ignition mod

I have a 86 cj with 258 i6,weber carb and header. Im thinking of adding a D.U.I distrbuter cap/coil with new wire and plugs. Whats the word with this set up? Good, bad or indifferent. what kind of improvement should I see? any other suggestions on ignition mods. one mor ? what the big deal with wider spark plug gap any way? thanx
 
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