You need to pull the trans too. See the writeup that includes the trans. Camo.. please man, remember the post where I'm not going to click the buttons ofr you.. bingo. If you search on my screen name and "eas y" without the space...you'd find that how to with trans included.
The only car I successfully pulled a TC with a motor was a Bonneville, a big ole 96 Bonneville and I had to lower the subframe to get the HB to move forward far enough. There shouldn't be enough room in a W body from my experience. Do both engine and trans. However, in reality, you need to unlock th emotor to get all the bolts. Best of luck, a new converter may be cheaper than the effort to get the bolts.