Re: 1939 pickup 1/2 ton engine noise
It sure sounds like two cables may be reversed...I'd start there. Almost certainly ignition related in my opinion.
Terry
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"  302
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