1965 Offenhauser 273!
I have a recently manufactured set of them on my 65 and 67 Barracudas. I like them because I like finned aluminum valve covers, but also because they will accept the factory Commando 273 oil breather cap and pcv, and put them in the factory location.
Actually, Offenhauser still makes the valve covers (or, at least they did the last time I checked). Maybe the intakes, too. Haven't checked them, but they still have the tooling for all sorts of their vintage speed equipment.
I have a recently manufactured set of them on my 65 and 67 Barracudas. I like them because I like finned aluminum valve covers, but also because they will accept the factory Commando 273 oil breather cap and pcv, and put them in the factory location.