What RPM range does it surge at? You should be able to tell the difference between an engine that's loping below the cam's powerband and a carb that's causing a lean surge.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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