72 Duster with a Rusty fuel system....how do I avoid this???

I kind of like Rusty gas tanks.I almost got two Grand off or 66 Barracuda cuz the guy couldn't keep it running. The $200 gas tank Was a relatively easy fix. It was a little bit of a bear coming out of the 66 Barracuda the way it comes through the floorboard and stuff but Still quite cheap and easy fix for a massive problem. And I quoted this Particular comment because of what the sending unit looked like and you can almost imagine what inside the tank look like? I couldn't get nothing but red fuel out of that thing till I change the tank.
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Original oem 66 barracuda sending unit for sale cheap !
the one I pulled out of my fish was worse than that, it had partially fell apart. the tank even had holes in it. we have 91 octane real gas available around here for about 70 cents a gallon higher than the 91 at quicktrip. "91 used to be cheap lawnmower gas !