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i just want better gas mileage and reliability.
No OD info but in the meantime you might dial in the dist & possibly go leaner or richer depending on where the carb is at now & the most restrictive system is the exhaust. You might put in a new timing chain & adv it 4 deg. a 360 MIGHT give better mileage. what is the axle ratio?

live every 24 hour block of time like it's your last day on earth