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Re: exhaust spatter
I just went through this battle myself with a quadrajet on my 71 blowing really rich fumes, smoke and black soot. So bad it was spraying the walls and floor of my garage.
I adjusted the timing to 15 BTDC and used a vacuum gauge to set my air/fuel getting about 17 inches of vacuum.
It did not help the black soot on startup but it ran great once it was warm.
I turned my attention to the choke and ended up just having to adjust my electric choke. It starts right up and no smoke or soot now. For reference, at 7500 feet in elevation my choke is at about 12 o'clock now. Previously it was at about 10 o'clock.
It sounded like a few above already mentioned choke but that is where I would look if the vehicle runs well once warm.
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