The "classic" setup on a (moderately) high po engine is PCV valve on pass side and an open VC breather on drivers side. Valve covers well baffled on both sides.

This has worked well for me on a warm 496 that sees road track time.

I guess the 10AN line to your air cleaner is a problem. I guess a fouled air cleaner element?

A high cylinder pressure high po engine will have more blow by when hammered vs a stock engine (even if the hi po engine is healthy and tight). It needs to have a free vent to atmosphere for those times. The vent will act as an air intake for the crankcase when cruising... it lets air in and the PCV sucks fumes out.