That breather will do absolutely nothing and you might as well not use it!

Where did you get the breather? 2 on the top and 2 at the bottom? That's strange.

Ideally you want to breath from both sides of the block, and not the rocker cover, as this is all from positive crank case ventilation, which for a roadcar is overkill. Rods Spec-R set up is what you'd want if you were running massive boost, as you're gonna get a lot of blow-by (well more than a normal road car).

Ideally you'd want a 4-port breather, with the two feeds from the block going to the top, the return (ideally with a non-return valve) to below the oil level in the sump and a port on the top to provide only air (and the small amount of entrained oil) to the catch tank.

Shame GGR got rid of their handy guide, but just do a search, thousands of threads on it!