I read someone is installing a 500E in a coupe, check 500ecstacy if they are up. I "think" the firewall and cross member are different and need mods. Then transplant or modify the wiring. You may want the larger fuel tank, bigger brakes, and heavier springs. Not sure about IL but in CA you need to have a DMV referee station check compliance with smog requirements.

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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD
'92 500E, 110k, Spruce green, stock SOLD
'94 E320 Cabriolet, 130k, E500 wheels, Emerald green SOLD
'94 E320 Cabriolet, 110k, black, stock, SOLD
'88 300TE, 229k, dark grey, SOLD
'90 300CE, 212k, white, new paint, SOLD
'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion