If you have a pan, like a moroso for example, that has a top horizontal surface(like off an extended sump) this tends to work better but can be done on any pan with some work.
You weld a vent tube off the pan(horizontal surface) up to an air/oil separator chamber. Large vent tube, in the 1.5 - 2" ID range). The a/o can them be plumber directly into the intake. This system immediately purges blowby directly from the block/case and bypass the requirement of the flow to move through the head castings. It’s the same way you’d setup a vacuum pump, just sans the vacuum pump and hooked to the intake(or plenum)