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..