3rd gen tire and wheel questions

[rnico]

i have a 85 z28 that i want to lower using eibach sportline springs (bout 2") my question is: what is the widest wheel and tire can i stuff under my car without rubbing. i dont mind doing minor mods to the fender wells if nessary to gain an extra inch or so and i dont care if the front and rear are diff sizes (larger rear tires look better anyway)

thanks for any help!