I watched a gentleman build a support bar out of wood. I don't recall the size of wood, but it was THICK. He bolted it together when he figured out the length he needed and used SEATBELTS as slings to hold the motor.
I wouldn't suggest going this route, but it can be done.
I can't beleive the trans is 400lbs +! I use to do i25 and 440 trans back in the 90s. I know the mechanics at cadillac pull the engine and trans together but they have a hoist and pull it from the bottom with a special tool to holds them. With the engine and trans together, it got to weigh about a 1,000 or more lbs. I got a front end air jack that will give me enough height to get it out. I need to replace the engine and was hoping to pull the trans out from the bottom and the engine from the top. I wish they would have made a split frame where you could remove or swing half of it out of the way,drop the engine down using a engine support tool, which I have, and pull the trans out. I guess GM doesn't want us to work on these Cadillacs! I thank everybody for their replys. Has anybody pull the 4.6 engine out of a 1999 Sedan DeVille?