When I built up my 331 this past summer, I had my Autologic chip re-burned for the extra cubes. It idles like a dream. It's amazing hw many guys have problems getting their cars to idle nicely even with just 302s.
JMO,
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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