Unbolt the front motor mounts. Lift the engine with a jack...as high as you can.Unbolt the drive train support rail. Remove the front motor mounts, then drop the drive train/engine down as far as you can. This will give you a little more space.
A re-assembly mod that someone suggested to me...and I will implement the next time I pull an L-134:
Weld both top bolts to a piece of flat bar steel. Essentially link the two bolts together. No longer will you need to hold the bolt on the back side. No more spinning. No more fiddling with a wrench on the back side. All efforts shift to simply setting the nuts. Still a pain in the *rear end, but much more manageable.
Tim