Gas tank move?

[Afishinado]

I'm a snowbird, so this winter while I'm in Florida I am having my bench seat redone (foam & OEM style vinyl). Having rockers replaced, gutter refinished, one door repaired, all the rubber in and around the doors replaced. Having the antenna hole, a spot light & rotary beacon hole filled. There are a few very minor dents, and that's it. I'll get it painted next winter. Only other improvement will be power disc brakes. Happy with the 292 & 4spd.
Sorry for getting long winded description..
So... If I have gas tank moved, will I pick up any space to slide the seat back farther? Otherwise I don't see it worthwhile.