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The main thing you gain when removing the early Lean Burn system is a better spark advance curve. I think that's part of what made them more economical was the lazy spark advance. The conversion generally will make the car seem faster due to the better advance though I suspect overall power is unchanged. I've yet to be lucky enough to find a proper vacuum port for any car I converted. The good news is you'll probably gain a little power form an earlier carb because it is probably jetted a little richer. Better mileage really isn't something you'll gain from the conversion unless the car wasn't running right with the Lean Burn to begin with.
 
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