Above sounds like great advice!.
The get it back and running idea especially so!.
Also the more documents the better so it may be worth considering dropping the tank for the build sheet too?.
I don't know if you can peek past these Enots flip-caps like the factory fillers...they do undo and necks are threaded so it may be possible to first see the sheet from above?.
And again considering the whole situation, Joel may help w/ docs or memories of this specific car especially if he spoke w/ your brother...sure worth asking at least?.
Again best to you and your family Dale...nice to see everyone here help in any way they can!.
~ Pete