68 GTS won't stay running

Some updates, the gas tank is completely clean with zero rust. A shocker, but true.

Did not test the fuel pump because when I saw this i assumed its bad. Will replace that tomorrow.

Also realized my fuel gauge is completely wrong. It was registering empty with a half tank. I always thought it drank gas too fast and never took as much to fill it.

The sending unit is new and unclogged. Looks 100% good.

Only other factor is the fuel lines may be clogged if its not the pump. But my thing is, if the tank is perfect, the lines shouldn't be bad, so hoping it's the pump unless its the lines that rusted causing the filter to crap up. Either way, my new fuel filter never filled all the way so it's gotta be starving for gas.

I also noticed that a hole at the top of the tank above the sending unit hole is plugged. Looks like a spot for a vapor line?

Any suggestions on the gas gauge and missing line would be appreciated. I will let you know how the car turns out tomorrow.