I increased the jet size on my 65 tri power center carb from 063 to 065. My 389 is mildly modified. 030 over and a crane single pattern power max cam. The reason I did is that I noticed the spark plugs were indicating a lean condition. Since I installed the larger jets The plugs are now reddish tan indicating normal combustion. It also reduced the engine tempurature from 190 to 185. No plug fouling experienced. Did not increase the size on the end carbs. Hope this helps.
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