Will a b/e-fuel tank fit with a modified a-body pan?

Decided I wanted more fuel capacity in my 1973 Duster as the thirsty little
Motor I plan to swap in eventually will need some mileage between fill ups. The previous owner removed the tank and drop down trunk section due to heavy rust out. I figured since the pan is gone, I might be able to use a 1966-1974 b-e-body gas tank or even an aftermarket one that will get me closer to 19-20 gallons of capacity. Reason for a stock style tank is I can still try to use the side fill up on the driver side. Any info on fuel tank swaps?

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