i think i remember reading an internet article on that car, and how much of a horridswap it was.
steering rack needs to be swapped for an e21 unit and some other stuff. im guessing sump clearance, and i think i remember someone mentioning hood clearance.
M42 2002, 2002iS, would still be one of my ultimate projects/cars. i'm sure its doable, well, anything is doable. even run it on twin webers to keep the old skool look. thatd help hood clearance too. haha.
So, 2002iS, with an m42b21, huge cams and carbs. turbo flares and deep 15s. Excuse me for a sec.