Carb and tuning issues with new headers

My 68 cuda has a 340 with a mild cam, automatic trans and 355 read end
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[/QUOTE]I had to run a lot of advance because of cam (I don’t know the size of the cam)
how much is alot of advance? what is total, and what rpm is that at?

i like the first metering rod change they say, #23?? what is the vacuum reading at idle?
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