Information regarding the oil pathways on different "generation" engines is
shown near the bottom of this page , and more detailed information for different years is shown on other pages).
I think you do not need the special "hollow" bolt from 58-62. My guess is that you could use the 59-62 connector with the 1958 block/head/rocker-assembly.
Pre '68 Dave might chime in with clarification/correction.
