I'm running billet valve covers, each cover has a -12 fitting welded to the cover. Each hose goes to its own catch can. I did have to baffle the inside of the fittings to keep excessive oil from being thrown through the fittings off the rockers. I don't see any positive pressures.
You should be able to do the same thing I did with the oem valve covers, just put the fittings between the cylinders and check clearances between the fittings and the rockers.
I'm having issues with posting pictures on this site, they all have to be zoomed in and close up, losing interest in this site.
