What's the backspacing and width on the wheels? A 295 width tire will be pretty tight under the T-Bird, and it will certainly depend on rim width and offset. The most that will generally fit without major work would be 10" wheels with around 6-3/4" backspacing. If the wheels have less backspacing than that, they'll definitely be sticking out.
Jason check out www.sccoa.com theres a guy there that always has deals on rims for tbirds. There nor eason to do the hub swap mod of the time. I know he has bullits and fr500 wheels in the correct tbird pattern but im not sure if he has deep dish. If you want i can send you a link when i get home from work.