Funny, on the ride into work this AM, I was thinking about how I am going to do this, Was my plan and should be doing in the next couple of months. And the thought that came to mind was how my engine lift legs would probably interfere with the engine rolling under.
Looks like the US Car Tool idea gives you more distance. Allows you to put the legs on the lift all the way out and not have to extend the boom, making it much safer.
http://store.uscartool.com/uni-lift-unibody-front-end-lifting-tool.html