What I did was buy some 6 ton jackstands from harbor freight. Way stronger than I needed, but nice and tall with a pretty wide base. I also nailed a length of 4x4 to a 2' long 2x12 to make a pair of elevated chocks for the front. Maybe this wasn't necessary, but my car is fairly low, with a chin spoiler, and I didn't want to hit the floor with it while the butt was in the air. I was planning to buy a furniture cart and mod it for the engine, but my Father-in-law (in whose garage I did all this) had some casters and a pile of assorted lumber, so I built my own using some scrap 2x6's and plywood.
The center piece lines up under the case, with the gap in the center providing clearance for the sump plate. The side pieces line up under the heat exchangers, but don't provide any support. Just balance, to keep it from falling over.
Unfortunately it is a little tall, so I needed to raise the butt a little more than had I used something else.
I ended up only raising the car about 2 feet, then lowered the engine & transaxle down to the cart.
Once it was on the ground, we moved the floor jacks to the jack points and raised the back of the car until it cleared the engine. I took the valance off so it didn't have to go as high.
As soon as it was out, we dropped the car back down to a more reasonable level. It was pretty high up, but it seemed stable.
We reinstalled it the same way, Raise the car, roll the motor underneath, lower the car about half way, raise the engine. It seemed like a good compromise.
Tom