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That SN does say the chassis is a early ‘26, but being a 4 cyl Jughead indicates it should be earlier, so just keep that in mind. The engine looks pretty complete, so you should not have a problem getting it going if the mag has spark. Stuck valves can be a problem, but easily accessed from the top and side if you don’t have good compression.

Based on the pic with the fender, it’s earlier than a 26. 26’s have smooth rounded fenders. Does the engine have a head on it or is it a jug head ? 4 cylinder or 6 ? Weight in that condition would be 8-9k looking at what is missing. The chassis from the factory would have been around 9+ depending on what wheels/tires it had on it. As suggested before, get the SN from the top of the left frame right at the front. It may be a bit worn as the hood sits right on it. Then contact the Mack museum using this online form https://www.macktruckshistoricalmuseum.org/contact-us/ They can tell you everything about that chassis from build sheet to who it was initially sold to. They can also provide you with just about any part print you need to restore it Having restored one starting about that condition, it’s doable at a reasonable cost if the engine is free, and you have most major components. Sheet metal components can be made. But you definitely have some work ahead of you.