rear main leak

You may want to look into the ME Wagner Dual Flow PCV that can be adjusted based on what your engine needs. Would be a lot simpler than going to a vac system.

https://mewagner.com/
Hey man - question for you on this. Since a PCV valve really cannot work at WOT (no vacuum at wot), could you also run the header evac system in addition to the tuneable pcv valve? Not sure how the plumbing could work in that scenario. I do drag and drives - so idle, cruise, AND WOT are places where I would like to vent crankcase pressure better.