Will a 2008 gsxr 750 motor fit in 2007 600 frame?

No, a 2008 GSXR 750 motor will not fit in a 2007 600 frame. The 750 motor is larger and heavier than the 600 motor, and the frame is not designed to accommodate the larger engine. Additionally, the 750 motor has different mounting points than the 600 motor, so it would not be possible to bolt it into the 600 frame without significant modifications.