I just used the OEM CCV setup from the ABL engine. Breather puck, molded hose and flange. It all fits the AHU/1Z, but only if you use the Dorman 42062 valve cover grommet. The ABL has a valve cover that has an angled CCV port, and the Dorman just happens to be the perfect fit to the AHU valve cover to angle the puck the right way, in addition to providing a tighter fit so it doesn’t leak.
The magic of the ABL is that it uses a single all-rubber hose that is oetiker clamped at the bottom end to a plastic flange, which seals to the block with an o-ring. This results in a CCV that doesn’t leak.
The ABL breather setup is not an easy set of parts to find as the parts are all discontinued and came in a vehicle we never had in the USA, so I had to source a setup from Europe for an eye watering price. That said, I’m happy with it, as it should last a while, and most importantly, it doesn’t leak.
The hose-to-block flange is the critical piece, which is discontinued and doesn’t appear to be available aftermarket. If someone made the flange to fit the hose, the breather puck and hose still are offered on the euro aftermarket so you could build your own. The flange could be designed to use RTV instead of an o-ring too.