Almost everything unbolts from this engine in a fairly straight forward manner except the water pumps. You have to know about the "secret" bolt. It is inside the housing at the end of the extension in this picture. I always imagine that getting this bolt out is going to be a horrific struggle and I am usually surprised at how easy it is most of the time. Well, maybe not THAT easy, but better than I expect. You can see the rusty pointer for timing the engine sitting in stark contrast on the aluminum front cover near the crankshaft pulley.
With the water pumps off and the timing gear cover off, it is easy to make out the truck motor mount. Every 8BA style flathead block I have ever seen has the bolt holes for the truck mount. You can see the aluminum timing gear which bolts to the end of the camshaft and meshes with the crankshaft gear which you can see behind the pulley. On early style engines, like 59As, the gear pitch is in the opposite direction so that the cam thrust is against the block. In late engines, the cam thrust is against the timing gear cover. Also visible just inside the water pump impeller openings are the end exhaust ports which, like all of the exhaust ports, go through the water jacket. The small holes at the top of the water pump mounting surface are not bolt holes. Rather, they are water passages which allow the water pumps to move some water around in the engine before the thermostats open. Some people plug these so that, after the engine is warmed up, hot water from the engine doesn't dilute the cooled water from the radiator. The medium sized holes below the big impeller holes have been a mystery to me. I think they must have had something to do with the casting process. Water pump gaskets don't have a hole for them. Of the two holes at the very bottom of the water pump mounting surface, one is a bolt hole and the other lets water into the pump's lower hose bib so the block can be completely drained by the drain cocks in the radiator.