Sure, you can drop just the engine. You'll need to disconnect the CV joints and as you lower the engine you can reach the upper transmission to engine bolts. Be careful not to bend the transmission input shaft. I have the rear wheels removed and after diconnecting everything actually lower the car and place the engine on my ATV jack. In a crunch on my 914 I've used a furniture dolly. Then raise the car without the engine. Just take your time and make sure everything's disconnected.
