Engine failure after oil change

the heads are identical just switched end to end. Whatever hole you have at the front of one is at the back of the other, i.e. neg battery cable bolt hole left front , chassis ground strap right rear. A diagonal chain there will work pulling engine alone. I wouldn't trust it pulling engine and trans together. The chain will travel through the hook, possibly faster and farther then expected. Tail shaft housings can destroy header panels grilles, hands, etc...

I just dont know how to configure a chain or chains when pulling both at once.
A load leveler might be the best advise, although shifting the load in flight isn't exactly what they are meant for.
Everyone does things differently. I prefer to tilt the trans enough to access those upper bell housing bolts and leave it right there so it all goes right back together.
Straps around the torsion bars will support the trans which frees up the floor jack for other uses.