Fuel Tank Removal

Well, I finally got my tank out. I had a very tough time getting the grommet to move on the fill neck. I had to trim the grommet on the outside about two-thirds of the way around (as far as I could get). Then I shoved the grommet into the tank about half way around. This finally made it so it moved on the fill neck. Then I ran into interference with the passenger side exhaust pipe (from an aftermarket dual exhaust). So I had to remove the passenger side exhaust pipe (they didn't make it easy by welding the nuts to the hanger bolts). That worked, the tank is out. Now I am wondering if I should get a new tank or clean up the old one - thoughts?? I do need a new sending unit - I tried to blow the old gas out of the tank through the gas line attachment on the sending unit by slightly pressurizing the tank - nothing would come out!