I did this swap last fall in my 91. There were no differences, and no problems. My advice to you is to take out the motor mount bolts, raise the motor up a little, take our the motor mounts themselves, and lower it back down to get to the top bellhousing bolts. I had a heck of a time getting them out. I did this when I pu the 63 motor back in too. It makes it easier to get them torqued back in right. Good Luck.