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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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