[KingLT1]

I run metco breathers on my engines. That being said the MM wild catch can has a breather so it should do the same thing, but you might try adding the Metco breather on the Valve cover.

I had a rear main go out on a new 5.3 LS(mild build) that was less than 1k miles old. Replaced seal added Metco breather, no issues since.

If you don't want to try the Metco breather, One thing you will want to make sure is that your breather lines are all upgraded to -10 and routed correctly for the MM wild can to vent crank case pressure efficiently.