Best to remove the spark plugs and rotate the motor before starting.
The housing for the steel bevel drive gears was integral with the drive side crankcase.
Then before replacing the rocker caps you shoot a stroke over the top of each rocker arm to oil the inner rocker contact tips and thrust pads , and the lower valve stem and guide . Then you can fill the connecting rod big ends via the feed quill bore , even easier to simply do so via the small screw opening in the end of the quill, delivered through a clean shop rag, one layer across the opening to act as a seal.
In all near a pint can be injected by these means described above. Next one inserts the oil can spout through the forwards banjo bolt opening deeply enough to deliver oil into the filter element housing and pumps that at least half full , soaking the filter and cutting down on the time it takes before delivery of oil begins to the rods etc upon startup. Here you can load up the timing cover passages via the top feed quill beneath the dome nut, replace .
Check the transmission level and the primary chain case contents, draining off any excess via the level plug .
That covers the motors immediate needs for firing up after long storage or being rebuilt.
This had wheels of hard steel, 1-1/8" oversize mainshafts, Vibrac rods on caged roller bearings and a pressed-in crankpin. Buck told me that an improved ESA was used that probably became the Series D pattern.