I'm with Greg - I'd stabilize the rest of the body structure before cranking back on the neck to realign the crack along the fingerboard.
Thanks for the comment. Just looking it over with the quick grip pinching the top, it doesn't look like the crack's halves will meet. I suppose a consequence of the wood shrinking process.
What happened to this instrument? Did it get baked? Is it dry as a bone?
Before you do anything I think it needs to spend a week or two with a few humidifiers in the case so you can tell if the top is going to close up. If it is as dry as it looks, I would suspect also back braces are loose at the ends. The body needs to be stable and solid before you start trying to apply force to the neck.
Hey Greg, appreciate that. I think it must have had its cholent sessions sitting in an apparently sunny spot. It's a good little project, though could use another week in the case, as you say.