Look at these articles:
http://www.moparmax.com/tech/i_5-wheel-1.html
http://www.moparmax.com/tech/ii_1-dart-1.html
http://www.moparmax.com/tech/2008/iii_3-rampage-1.html
You will find the work that has to be done to narrow the A100 axle.
Have fun!
Good idea! I am dreaming of that axle, too.
You should buy the DVD from Steve Magnate How To Build Your Own Altered Wheelbase Funny Car.
Go to funnycarfarm.com there you can order it. You will see every detail. I love this film.
Have fun!