Adjustable rocker identification?!

33IMP said
The Letter car Chryslers, 300C, 300D etc. The optional engines sometimes had solid lifter cams, so adjustable rockers.
The wedge 300's would be the 300E, and up.

Not having studied the 300 series cars that much what engines did they have in them that had adjustable rockers?
273 or 318 poly, 413?