You will have to lift the engine high enough to clear the engine mounts on the crossmember in order to separate it from the trans. You do not have to slide the trans back, leave it's mount attached. Unbolt all your upper bellhousing bolts before you raise it. (no hand room once it's up!) Leave the bottom two in to keep them together at this point. Now you can go under and undo all the torque converter bolts and rotate and slide the converter back into the trans. Get a small floor jack under the trans. Now remove the engine mount bolts and raise it up above the mounts, your bellhousing will likely be touching the tunnel now, or close to it. Put your floor jack under the trans pan to support it at this height. I use a piece of wood as wide as the pan to disperse the weight evenly. Take just a little weight with the jack. This is the height you will reinstall the engine at so don't let it down. Now undo your last two bellhousing bolts and wiggle it ahead. Should slide right off. It helps if you have a leveling unit for the engine so it will be on the right angle. Otherwise you will want to set the chain to hang a little lower on the back end.
Hope this makes sense!