I think those wheels would look great on your car, and No you wouldn't need to black the rest of the car out.
You already have the dark chrome headlamps on the GT, and maybe a black plastic tail light bezel would be a nice touch, but you wouldnt need to tint the tail lights and all of that to make it work.
2005 GT Premium - Mineral Grey 5-speed MT
Vortech Supercharged - Steeda Billet LCAs, Steeda UCA, UPR adj. Panhard bar, FRPP K-member brace, GT500 Strut Tower Brace, Walbro 255lph Dual pump, FRPP 39# injectors, AIS Water/Meth Injection, Ported Throttle Body. 440rwhp / 406rwtq