Tom,

Post the code that is pressed into the block in the ledge just to the rear of where the distributor enters the block. Someone here should be able to identify the size/year/application of the engine.

Here are locations of other casting codes for high-pressure 235/261 engines. I do not know if these locations are the same on earlier 216s/235s (maybe someone will let us know if the locations are the same).

Tim