No "oil mods", stock block and passages.
No valve caps.
Valve rotator delete- therefore different valves and springs were used, also to compliment the updated spec. 340 style cam.
"Hemi style rocker arms"? No such thing, unless you're referring to 273/340 6bbl. rockers. But those never came on E58s either.
W2 heads NEVER came on ANY production line engine.
The E58s were assembled by the Chrysler Industrial/Marine division, as were most all performance oriented engines at that time.