largest tire with 2 inch drop on a Z28

i have a 85 z28 that i plan on lowering real soon ('bout 2 inches) using eibach sportline springs. what are the widest rims and tires that i can stuff under the fender wells without any problems or major mods. i want to run 16 inch rims but havent decided on any style.

thanks for any input!!!!!!!!!

rick