Stabbing engine and trans?

Especially by yourself, if you're not going to do it from the bottom, I'd get the trans positioned under the car on a jack with the crossmember bolted to it (but not to the car). Lower the engine in a little at a time, shuffling the headers as needed. Then when engine is close, roll trans forward and attach to engine. Now the whole unit is supported in front by the crane and the back by the jack. Raise back of trans to attach crossmember. Settle engine on mounts and done! Well then bolt up headers which is no fun....

As someone mentioned, lower the engine in SLOWLY!!