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Wondering if anyone can help, I have a quikfuel 850(no choke) on a 434 sbc in a 66 nova, m22, my current problem is after a couple wot runs around the block the car starts to run terrible around 1/8 throttle(major hesitation). Upon inspecting the carb the primary side is always covered in black residue, which I believe keeps clogging my air bleeds, which I believe is what causes it to run rough, after I clean it down with carb clean it runs good again, so I'm wondering what is causing this to happen. I'm new to the site and learning as I go, so any words of wisdom would be appreciated, thanks.
 

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I'd be a little concerned, if the residue is carbon, that it's an intake valve issue. Maybe burnt intake valve, intake valve sticking open, or even weak intake valve springs allowing leakage. I guess I'd start with a compression test and leak down if I truly suspected it was carbon residue building up in the carburetor.
 

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The first thing I would check is valve adjustment.

Al
 
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