From your previous photos, it's definitely a "GEN I small block Chevy" and they are very interchangeable between displacement sizes, and there is much commonality between the models, so many parts such as the waterpump you are dealing with will fit any of them.
Also, unless you know it is the original engine, it could be one of a wide variety of displacements.
There's a CASTING NUMBER at the rear of the engine that will really narrow it down, and an engine number stamped at the front of the engine that can be decoded with the right resources.
Here's two links that should help with some of that.
(I don't remember the year of the (older) truck, but I would guess the two most likely possibilities are a 283 or a 327.)
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