Hard to believe your tank was useable given the condition of that sending unit.It doesn't take much to drop the tank. You'll be able to see what you're doing and give the seat a good inspection. When you lock the ring things tend to move around a bit and could move the gasket. Also gives you a chance to clean and paint where the tank sits.
I bought a Quanta aka Spectra. Works great four years now.
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https://www.forbbodiesonly.com/moparforum/threads/1962-gas-tank-removal.128773/page-2#post-910649382
Here's my old one!
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Hard to believe your tank was useable given the condition of that sending unit.
Wow that was hammered.