Most likely you are referring to what is often referred-to as the 1947-1954 [Chevrolet] Truck Factory Assembly Manual?
https://www.google.com/search?q=195...&sourceid=chrome-mobile&ie=UTF-8

That is actually a 1954/1955-1st assembly manual.

The fuel/gas tank design changed in 1954 - in particular, the fuel “pickup” in the tank, and where the fuel line exited the tank.

Otherwise, other parts of the illustration should be helpful for earlier years?

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.