Here is a link to some pics
Flipped Motor Mount - Page 2 - LS1TECH
Basically right now the solid part is mounted vertically. Allowing the motor to rock forwards and back easy. By flipping it your moving the solid part horizontally. This allows alot less forward and back movement. Kinda makes soft shifts smother as your not getting the motor/trans rocking, and stabilizes it when trying to put down alot of power, should help with your 60 foot.