275/40's will fit with a little help from mr. mallet. On my car a panhard bar was necesary to keep the rear end from wandering in turns causing the tires to rub. But my car is really low. I've seen 295/50's on lots of cars, none were lowered and some had been raised up.
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89'notch
331ci Scat Stroker, Stage II Holley heads, ported Holley Systemax Intake, 70mm Holley TB, 50lb Holley Fuel Injectors, 80mm Pro-m MAF, AFM B-3 cam, Vortech S-trim Supercharger, AFM Powerpipe, EEC-Tuner, TKO, Koni, Eibach, HPM, etc...
Beaten Daily..
http://lowkey.stangnet.com