Rust in the gas tank, no wonder that fuel filter turned red Options

[SGB]

Didn't pull that gear stack yet, but while my car is up on 'stands and the carbs are out, I started to remove the fuel line from the carbs- disconnecting the SS braided line that I ran through a hole with a grommet to the firewall, where it attaches to the original line. I smelled gas and looked and the gas was collecting on the plastic line (drips- running to the lowest point) near the attachment. I drained the rest of the system, and finished pulling the tank. I've gota replace the fuel line too I think. Sure enough, the tank had a surprise inside....
Do I just get it boiled at a radiator place then try to pour por-15 or like that in there? Should I try that before boiling (I'm thinking it can't hurt)? I'm certainly up for lessons learned or bright or dim ideas...
Experiences?
Advise?
Harasment?