Bro u need a bundle of Money and time to make it close to a MUSHTANG
or u can get a A+ quality paint job of ur favorite color , get some muscle car rims , drop the car , change color of chrome parts , some tweaks with interior according to ur taste and just drive around and stay cool that,s enough
After that u can try things whatever u like...
U don,t need to change the look of the car as it already have a look of Muscle car just need to make the car neat and clean