The "F" prefix indicates the engine was assembled in Flint, Michigan.

255X
The 255 indicates it was second series 1955 (the end of the Advance-Design style trucks).
The X indicate 3100 or 3200 model vehicle.

The Z at the end indicates a car engine.

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.