Should I Replace Gas Tank - Car Sitting for 3+ Years

I purchased a '90 hatch 3 years ago and the car had been sitting in his driveway with no motor for about a year. I'm getting ready to put an old 302 into the car while I build the 351W. Is there anything I need to do to prepare the gas tank (additive, remove it, empty it???), I have no clue how much gas is in there, or should I just install a new one?? What about the fuel pump??? Thanks..
 
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I'd want to inspect the inside of it and pressure test it if possible.

In the old days with bikes that had rusty tanks, I'd Kreem them. But I think it's more cost effective to replace a fox tank with a new unit (they're 100 bucks or so as I recall).

Good luck.