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 - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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