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2.73 is what the Mustangs typically used with an auto trans. Kinda high for a stick shift. I wonder if the car was converted to stick? You might want to consider a lower ratio, 3.3 or so for highway cruising, 3.5 or lower for performance. Rear ratio will affect carb tune. A choke is not a bad idea in many parts of Calif. 600 cfm is plenty big enough.
Ernie
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