Re: 1966 Inline 6 250 ci. Nightmare!
Hi. I don’t see that you replaced the spark plugs. If that is the case, you should try new plugs. I’ve had similar symptoms and new plugs solved it. Also, once with a bad coil...same thing. Weak/intermittent spark can cause black smoke and give the appearance of a fuel problem. Hope this helps - good luck!
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