I bought an '87 327es from a junk yard, an '85 318i from a friend for $100, and traded both for a mint '86 m3 which was modded slightly. He had a dyno sheet laminated and kept 1 copy in the glove box, and 1 copy in the tool box (under trunk). She was 221 at the wheels. I hear theyre like, 180 stock, or so.
It was NICE to drive. My 327, honestly, was a beast in the low end, but nothin like the m3.
(i was told by BMP Design you can put a 325i head on a 327e block, it will give it the low end grunt, with the top end fire. 327es = 4750 redline, 325is=7500 redline.....i dunno if this is true, but might be possible. both L6 engines)