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Louis,
Actually, unless you use significantly 'wilder' cams that raise the peak power rpm, your 3.2 calls for 35 mm venturis and 38 mm thru 44 mm choke tube, so the 40 IDAs or IDS are ideal! Per the Colin Campbell venturi sizing formula on p. 154 of Bruce Anderson's Porsche 911 Performance Handbook, 2nd ed.
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Warren Hall
1973 911S Targa
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