I installed '70s Mopar type breathers, OEM Mopar breather grommets, and sheet metal baffles.
Baffles are held in place by 2 sst allen screws, double nuts, and locktite.
You could also weld the baffles in if you wanted.

They aren't the most installer-friendly parts I've ever seen... but once you get them all set up they seem 100% worth the effort.