67-72 UPPER A-ARM FLIPS

I HAVE NOTICE IN A LOT OF PROFILES FOR THESE TRUCKS THAT THE UPPER A-ARMS HAVE BEEN FLIPPED. I WAS WONDERING WHAT DOES IT DO? HOW DO YOU DO IT AND IS IT THAT MUCH OF A DIFFERENCE. I HAVE A 72 THATS SITS THE FRONT CROSSMEMBER ABOUT 2.5 INCHES OFF THE GROUND AND I WAS JUST CURIOUS. THANKX. PEACE OUT LUCKY