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oil leak

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6
I have a '66 with a '69 351W. i seem to have an oil leak coming from under the oil filler cap because there is always oil all over the spark plug wires. Why am i having this problem and what do i do to fix it?

TIA
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it's ventilated.
the engine has been recently (3 yrs) been rebuilt. doesn't seem like it should be worn out already. and if i recall it has always done this.
so, would i be better off with a non vented?
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i know that the original 289 i had was set up with a re-breather from oil cap to a connection on the air cleaner.
guess i'll replace every month
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