The car usually sits low to the ground like in the first pic. It has an air ride suspension. Its also been changed quite a bit since these pics. A mirrored firewall and white custom interior come to mind. Its a beautiful car and one of my local fav modified GTO's.
And yes that is a 72 GTO with a ducktail spoiler in the second pic. Its one of the two made from the factory and not a repop.