American power train offers A body 6 speed manual

Well seeing that Iam going to run a 31" rear tire, with 4.88 gears this might be a viable option for me. If the math is done right I can run the tranny in 5th gear for my everyday driving and run a 2400 rpm at 55mph. Then when I hit the freeway where speeds are 70+ mph I can drop it in 6th and still be running at 2333 rpm.
My car will be a street/ strip combo build. So it would be nice to have the gearing to shred up the track and then cruise down the freeway getting descent fuel mileage.