Thanks, Steve. The big bolts holding the mount to the arm are the ones I mentioned coming out from the bottom. They're out. There are two smaller bolts threading down into the frame that complete the mounting arrangement. I've got the outboard ones out but the shields block the inboard ones.
I didn't think about the springs pushing back up with the load off. I'll try again and watch. So far, it looks like the pan is going to be holding the whole front end and that scares me. As I lift, I've watched the engine to shroud and there isn't any relative motion. This could be explained by the springs keeping up with the jack.
I'll give it a try. I hope I don't need a new pan when I'm done.