airvolts: Get a copy of Steve Christ's
How to Rebuild Your Big-Block Ford. It will asnwer most of your questions about any OEM FE Ford. In this case, pages 30 and 31 cover how to ID a center oiler or side oiler. With that said here are a couple more pix of a side oiler block.
Block has just been cleaned. Note threaded holes on the right side of the block between core plugs and cross-bolt holes. Note, also, the boss that runs front to back parallel with the main-bearing center line which are intersected by those holes. This is where the
side oil gallery is drilled.
Here's a view of the back side of the block during assembly. Those two threaded
oil-gallery holes to the left side (right side as pictured) of the crank flange confirms it's a side oiler. Center oilers have two above the cam plug. A side oiler has one as shown.
Hope the information "overload" helps.
