Did you pull the little metal screen out of the bottom where the pcv valve goes? Not sure if that's the filter your talking about or not, but it sounds like your not getting any crankcase ventilation through the normal channels so it's finding another path.
How many miles on the motor, is it stock or modified?
Buddy of mine with a 332 had to use a vacuum pump because he wasn't getting enough crankcase ventilation and was shooting his dipstick out of the tube on hard launches.
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