[nick-moss]

I took the tank out of my 68 recently.

Make sure you have a large enough container to drain the fuel into before you pull the plug! Take off the the supply and return lines, undo the three fixings in the trunk, the sender wiring, breather pipe and filler pipe. The tank should pull straight out now, although it may be stuck to the foam seal. It helps to break the seal with a trolley jack under the tank, suitably protecting the tank with a sheet of ply.

Use POR15 tank cleaner, rust preventer and sealer, it takes several days to do this properly.

I would clean out all the fuel lines while you are at it and change the fuel filter.

Good luck