There are a couple different versions of "worth". One version is what is its value as in insurance. Figure probably 10K based on those pictures. Maybe more depending on who is doing it.

The other version is what can you sell it for. That one is much more complicated. IF its a numbers matching car that will help. Don't listen to those 350 haters. If it's a 350 car with the original 350... that's a good thing. A 350 will still rock and roll!!! Not as good as a 400 but still good. Ditto on the TH400. Should be a TH350 or 2 speed. If its not a numbers matching car, well than it just became a perfect candidate for a 400 and you can forget all that 350 stuff!!

2 biggest factors in selling a car like this are lack of rust, which it sound like you are still figuring out? And getting it running. It is amazing how much more you will get for a running car. Even if it runs poorly.

So get it running. You can probably get it running for a few hundred buck and the investment will be worth a few thousand!