From the pic through the sending unit hole that tank looks almost new inside.... swish some clean gas around in it and see how it looks... The sending unit with 2 lines is a keeper since i believe you have 2 carbs? if you don't then you are going to need to make a new setup with like a 7/8" fuel line to feed those properly.
P.S. i assume it has 1 fuel line to each pump then 2 lines upto the carbs? I didn't look over the cars thread but that would make sense having the 2 pumps like that?