[MOTORHEAD]

Steve: I have same car/engine set-up and also rear seal leak and plan to pull engine to fix it. I had to replace my bad hyd t.o.brg with an external slave and did it in the car. Had to remove seats, tunnel, drive shaft, tranny, Lakewood BH, and clutch. You would also have to remove the flywheel, and if you managed to get the pan off, I doubt you could get a good re-seal on it with the very limited acess. After you undo all listed above, pulling the engine would be the easy part.
Ted