I have some polished breathers that I would be willing to sell. Never leak and work extremely well. E-mail me if interested. One is exactly like the one in this picture and has a fitting for PCV to manifold or carb...the other has no fitting but vents without any
oil residue on the valve cover.
Here's a fairly recent engine pic with a brushed/satin finish that I converted to. The breathers are the exact same, just a satin finish instead of polished. Converting the polished to satin is easy (if desired).
I would think that these breathers would fit on a larger 460 motor without hood clearance issues.
-Dean