Do a search on 190revolution.com. There's a lot of young-kid garbage on that site, but if you look long enough, there really is good info there, specific to 16V cars. I seem to recall reading about modifying the backing plate when doing this swap.

If not that, then jack up the front of the car on good jack stands and the jack, and have someone turn the steering wheel lock-to-lock. I bet the backing plate is being forced into the rotor as it contacts a suspension part. If that's what it is, get the die grinder out and cut out the plate just enough to clear.

If the wheels turn, and the brakes engage and disengage, then I doubt you did anything wrong.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport