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Plugs

My orange 73 L is beginning to experience some slight sputtering, and I thought I would start by putting some new plugs in. Any recommendations for plug types, and the gap? It has a slightly modified engine with electronic ignition (not sure of the engine components from the prior owner rebuild, but it does have more horses than stock). It seemed to start some sputtering when I changed the oil & filter & added 1/2 Qt slick 50 (but I am sure that is just coincidental).
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