Early design
Later spec
I'll just put these here for CB72.
The description is when at idle rpm (vacuum pulling blowby) and not at high rpm (positive pressure at both heads).
Please note not only the changes in routing but also the position of the fitting at the rear bank.
Although the feature is different, from the blowby at high rpm point of view, the early model (black cover) had its port at the side and the later one placed it at the top.
If using early model cover and if your NSX is for track day only, I would even remove the PCV valve and block out the suction pipe at the intake manifold.
Connect the hoses from both the front and the rear bank to the catch can and if your local regulation doesn't allow you venting the remaining gas in the air, connect the 3rd hose to the rubber accordion port before the TH body.
There will be no more PCV so you will be forced to change eng oil at much earlier stage but for track day car, should not be a problem.
For mainly street driving car, the benefit of PCV system exceeds the prevention of blowby getting back into the engine so this modification is not required.
Kaz