I believe that to be legal, you must use the original axle location, no flipping of the body top to bottom is allowed. No altered wheel base is allowed either.
Make sure the wheels do not touch the body when the car is sitting on its wheels.
The BSA rules do allow you to relocate the axle holes as well as several other mods but, your local district or pack may not allow them.
My son worked the graphite between the body and the wheels because the wheels will move back and forth on the axle and tap the body as it goes down the track, the graphite helps it from slowing the car down some.
