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Neither of you with a similar problem mentioned what plug gap you were running.
As RPM increases coil saturation decreases. Try closing up the plug gap and see what happens.
My 393 will do something similar when the vacuum advance is hooked up. Revving it in nuetral will cause a slight misfire above 3K RPM because under no-load the advance goes to about 48 degrees. Not a problem while driving, unless I do it on purpose.
I run a Mallory coil and .045" gap on Autolite 3924's.
Ed
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