I would be crazy to try to put a MPG figure on the combination. However, as BrianP said,
Quote:
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All my carb fiddling experience is with motorcycle side-draft constant-velocity carbs; you can do things with those that can't be done with traditional automotive fixed-venturi carbs.
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Also, as he mentioned, you may want to install a more modern ignition system with vacuum advance. That alone could net 20% gain (as stated by Steve Davis
HERE).