[OldSchoolMotors]

I agree with the crank case breathing.

Is the new head a non-jet valve head ?

Is the PCV valve working correctly ?

Boost leak test , and pop you oil cap , does air come out like opening a soda ?

There is a trick we use on our stocker Conquest , take a boot from a StarQuest plug wire and slip it onto the dipstick , fits nice and snug.