Well, with my own research (Doh!) I found:

20 gallon Fuel tank Dorman 576-336 $93
Airtex E3947M, $118

My 1984 has dual tanks. Pondering on how to utilize the second tank, maybe as an auxiliary and use a transfer pump to move the fuel to the primary.

As I understand the fuel level is a 40-240 ohm, while the 1984 is a 0-90 ohm. Still researching that

thanks for the thread, it gives me options