Where to run the valve cover vent tube?

The thing is, the air filter bonnet has ALWAYS been the correct place, a baffle on one valve cover, plumbed as you propose to the filter bonnet, and the pcv on the opposite vc.

Issues:

Some aftermarket baffles are not up to the task, and many factory vc (generally not necessarily Mopar) had additional baffles below the hose connection baffle

Engines with excessive blowby WILL put oil laden air back into the filter bonnet

If you connect to the header, you will need one of the check valve fittings, you cannot just plumb the hose right in. There are diagrams here and there on how to build these. Basically, they use smog pump check valves

BUT IF YOU WANT to get "down and dirty," (And I doubt this is legal in WA) just hook a hose to the thing and run it down "under the engine" "road draft tube" style