Your pictures look like the filler neck coming out of the fuel tank is at the wrong angle. It appears to be straight up rather than at 45° angle pointing toward the fuel tube. Was that a new tank? If so how did it look compared to the original tank?
It was a brand new Spectra Tank. It's been a long time. I think this was a matter of "not knowing how little I knew" and the original tank was pitched before I had a chance to do a direct comparison. This was a younger, and much dumber, version of me as it relates to aftermarket parts. The Spectra tank was pretty universally praised as a perfect replacement, and I think that's still the case. For what it's worth, I think all the praise is probably deserved. Maybe I got a one-off defect? Or could it be that Rock Auto shipped the wrong thing....a tank for a different application?
Anywoo, I agree with your assessment...sure looks like the tank itself is to blame. I'm sure I can modify something and make it all work much better than it does currently.