Yes, I have Jesse's tappet cover with un-baffled breather holes. Huge mistake as it pours oil out. Before moving them I could fill a 2 quart catch can on one
WOT run. Now.....I haven't drained it yet. Drove it 300 miles.
I just drilled and tapped the vc with 8an - npt fittings on the injector line side. Just deep enough to get a couple threads engaged but not so deep as to get into the rocker arms.