My race truck runs a 3.08 (Chevy axle) which works pretty well for LSR racing with a 4 speed manual. I think the 3.07 will probably be a good choice unless you're going racing. The 2.47 might be a little hard to live with for daily driving especially with a manual trans though probably OK with the auto.

Remember to change speedo gears as necessary. If you can't come up with the right gears any good speedo shop ought to be able to make you a little gear adaptor to fix the cal.

Dan