well the t-bird is built on a fox-body chassis. how ever the rear end is IRS, so keep that in mind when you lock or drop the rear the wheels will camber. best thing, if you want juice and not bags. is some sub-frame connectors and added braces to the towers and areas of stress, being it is a subframe and when it tweeks it will really tweek, i would sujest going light on the weight. such as minimal battries and just 2 pumps. 4batt 2 pump would be what i would do if i didnt one. the front is struts and springs, so you would do this cylinder up front like a coil sprung car and discharge the strust shock, this will allow for quicker moves...but you could also leave it alone and have a decent ride.
the rear, i have not seen in some time being an irs, so that one will be left up to someone that knows bout them.