The breather's grommet is available via Borg-Warner ( or even Echlin , etc. ) and the PCV grommet is available in the "HELP!" section at the auto parts stores .
I think that some of the resto places also offer these items as well , and they're the *correct* pieces and not emblazened by a "made in china" ( :mumum: ) impression .
Is the breather itself missing ?
If it's not missing , then just clean it out , repaint it (if so desired) and reinstate it .
If it is missing , it can be had new as well . Again , it's a "HELP!" part , and is again made in china :sad8: .
I'm not sure if restoration breathers are made for '70-'71 and '72 & later motors ...
Stamped-steel-with-plating valve covers are widely available , as are cast aluminum .