I'm with edub, a decent intake would be great. We clean up the air up to the intake, and improve the flow from the exhaust back, but not much improving of the air through the motor. I'm not 100% sure, but back in the day, intakes and headers were pretty much mandatory to make easy horsepower. Granted, that was before computer controlled air/fuel mixtures, fuel injection, etc; but the idea should still be the same, air flow through the motor.
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