Just by seeing the gas tank location and the three speed shifter column, it's a 1948. what you to to it depends on your skill, money available and your enthusiasm. This is not a project for someone that has never done one before and has limited money. It will take $5000 to make it worth $5000 and even that is a bit wishful.
If you take on this project, my advice is to start with the cleanup and being very careful dealing with those mouse turds, they may carry the
HANTA VIRUS and it can be deadly. This article doesn't talk about wearing a mask, I would.
Cleaning up this truck may make it more sellable and would give you a better understanding of these vehicles. Removing all of the crud that has built up over the years makes it hard for anyone to really evaluate what is there. It looks pretty decent in the pictures, but that can be deceiving. My concern is around the inner cowl area, it looks like it may be pretty rusty. If this area needs to be replaced, that's a lot of work but plausible. Patch panels are relatively cheap and are easily found. I think you have a desirable 1/2 ton truck that would be a good starting point for hot rodding or making a driver.
My guess is that this once had a V8 installed and there have been modifications that I can't see. The rear end looks to be too short for the truck. I would check the front suspension and for modifications to the frame.
If it is really rusted and missing a lot of parts, then maybe this isn't the project you want to start with. But as I said, this is a good candidate for modifying because it is missing the engine and transmission. You can design it as you want.
There are lot's of opinions on what to do with this, it's your decision on if you are ready to tackle a project like this or find a running licensed driver for $3000 - $5000 and starting from there.