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too much fuel maybe?

I THINK I know the sound you're referring to.

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OP,I know that sound well, it is really rich at part throttle cruise. I have a wide ban O2 system on my car, all the Holley Dominator carbs and some of the 850 D.P. carbs. are bad at part throttle, they read 11.2 AFR or so depending on which carb. It is fixable, you need to restrict the idle and part throttle fuel feed and or open up the intermediate air bleeds if it is a three circuit carb. I have restricted the idle and part throttle fule feeds on several of my two and thre circuit 1050 Dominators to .039 on the I.F.F and .059 on the I.F.F.on the two circuit dominator List # 9375 non HP and the same on the 9375 HP as well as opening up the primary intermediate (center) air bleeds to .096 That makes mine idle at 14.8 to 16.3 at 1000 RPM and have 14.3 to 16.1 AFR at 1700 to 2500 RPM, really responcive and nice clean spark plugs all the time now