Check this thread on Renntech
http://www.renntech.org/forums/index.php?showtopic=3404
Be aware that there is some controversy on using the rear of the engine to jack the car. The engine boss used is plenty strong enough.
The question is if the engine mounts are strong enough.
They are fluid filled and some folks claim one might force failures when jacking by the engine.
The counter claim is that if they fail they were ready to go anyway.
Many of us use the engine boss to jack the car with no failures.
Personally. I use the engine. If this causes mount failure under controlled conditions in the garage I will buy two new ones, ~$150 for after market. I feel if they fail they were weak and should have been changed. It takes about 20 minutes to change them.