Here is the Milodon gear drive #13600 that is listed for small block Mopar and Chrysler 331 354 and 392 hemi. I am thinking that someone in R&D was concentrating on the mounting holes, and not the location of the early hemi oil galleys.
My question is would you use a cup type plug in each hole, or would you tap them for threaded plugs?

7046761-HPIM4177.JPG (293 downloads)