narrow band is just fine if you are looking for mileage.
narrow band, and a feedback loop of some kind allows the engine to find its happy spot.
At WOT, or even heavy loads, you can tune by just adding fuel from stoich until it runs with the most power. again, not really hard to do.
I would not buy fuel injection in hopes of more power - my experience is carbs usually make as much power as most bolt on fuel injection systems.
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