Finally getting around to working on my CGT

[Stony Smith]

My friends have been beating me up about letting it sit, so my winter time project begins. I have been gathering up information, and parts. But now it time to ask for advice, I know the CGT has a low set of gears(7:13) -so what does that translate to on the road with its 216, 60k -70k? I'd like to get more speed out of it at least a comfortable 80k, I found a 261 -and I'd like to swap out the gears for set from a longer wheelbase truck which apparently had a higher set 6:13ish, or swap out my axles with another set before I dump money into these ones -thoughts?