Oil all over motor ???

There's always a small bit of manifold vacuum present on a N/A engine for the PCV - even at WOT. It's the same pressure differential that fills the cylinders. It's just not more than an inch or so at best and for the most part, if the rings are fluttering and sealing is lost you're pushing so much oil pastthem it can't move enough to keep up anyway.
I always run a PCV. Occasionally on track days when they're running hard it does drip a little from the open breather side, but it's rare. You can use larger PCVs too. I normally spec big block Chevy valves when I have the chance to set them up because they are designed to pass more air than the Mopar specific ones, and they seal well in the larger grommets in the aftermarket covers. Honestly if there's that much oil coming out, there's probably a ring sealing issue and it's not making as much power up there as you might want.