wanting to drift my 04 gt

ok i have an 04 gt mustang with just about every bolt on part and a 3:73 gear i have experimented with throwing it side ways on wet pavment and am slowly geting more into it i would like to set it up to drift easy i plan on doing springs, and adding upper and lower control arm to stiffin up the rear end i also plan on doing sway bars and lighting up the car a hundred pounds at least i plan on switching the rear tires cus my 18x9 are to expensive to smoke will it help at all getting more weight out of the rear or is that the opposite of what i wana do??? if anyone has suggestion please post or just email me @ worrgp@juno.com thanks for the help