I have always wanted to remove the shock absorbing mounts for the bumpers and replace them with something lighter and simpler - there's got to be significant weight to lose there.
A power bench seat you say? Gawd, that's got to be heavy. Helped a friend pull the power seats out of a '70 Lincoln and we thought we'd missed some bolts. Nope - it's THAT heavy!
Nothing will go as fast & easy as your first 325 lbs...