fuel spill-over

Hello everyone, hope we are all doing well in these times.
I've got a question that has had me stumped for days now.

essentially, I have a 1974 dart special, and I'm a little new to it. Im currently trying to fix some issues with the clusters such as no feedback on the fuel and temperature gauges, because of this, I always top off my tank whenever I go for a drive as the fuel gauge does not show anything but empty. Lately as I have gone to fill up, (my state does not allow for self service pumping) the gas will shoot back out of the tank and shut the nozzle off after a minute or two. Im not too sure why its doing this, as it fills the tank, but doesn't trigger the nozzle to stop pumping. Im more familiar with electronics and some mechanical work but I have yet to explore the A bodies fuel systems. Can anyone help me with my issue?
thanks in advance :)