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You didn`t say , but does the secondary side have a power valve ?? If so , you might try taking it out , plugging it and putting richer secondary mains in . My carb with mechanical secondaries , but on a much larger engine , has 82 mains on the primary , 3.5 PV on the primary , no PV on the secondary and 92 mains on the secondary . However ... every engine is different , and again , I have a 482 big block .
You can get a rough idea of mixture by looking at the plugs , even though you can`t do full throttle runs in town . If the base of the plug body is a light gray , you are close ... if black , you are rich . Again , this will be a rough check .
Bob
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