Stabbing engine and trans?

I've done it both ways several times.
Putting it in from the bottom has a lot of advantages, but from the top is okay if you are careful and have the front of the car high enough.
One thing to consider is that installing the engine and tranny bolted together from the top is best done with two people and a blanket wrapping the unit so you don't scratch the paint and GO SLOW.
Also, the end of the tranny must be capped so the fluid doesn't drain out and make a mess.
I always used an old yoke or a cap, an old spray bomb cap duct taped to the end of the tail housing works good with a rag taped to it.
If you do install from the bottom, make sure you count the turns that the torsion bar adjusters are in so you can return them to the proper place after the installation.
And if after you back off the torsion bar adjustment bolts, and the torsion bars come out with no issues, you're golden!
I use an old pair of vice grips with a thin piece of pipe welded to the inside grip area to clamp on them (so it doesn't score the torsion bars) and drive them towards the rear of the car until they are out.
Installing the engine/trans combo is best from the bottom, but stabbing it in from the top is very do-able as well.
I hope this helps...