Well here's a quick update. I ended up getting the tank from SpreadEagle. It was in much better shape than mine was on the inside. Hopefully it's cleaned, prepped, painted, and installed this week and then they'll see about getting that 4.0 running with some fresh gas. We'll see if my old Carter is worth a dang and if not I do have a spare. Hopefully one of them will do the trick.
Here is the tank I got from SpreadEagle. Outside looks a bit rough, but the inside is pretty shiny and that's all that matters. The shop will be cleaning up and putting rust preventative on the outside of the tank too.
The 4.0 is in now, but it's awaiting the gas tank removal and replacement. Then it's off to the exhaust shop and hopefully ready to go. Might need some more things. Suspension, brakes...hopefully no issues with the transmission or tcase.