Yep i question that too. although i wouldn't do it i often use a 2 bolt lift using the intake manifold bolts, probably weaker than the intake bolts. i don't know which is better, but every time i install an engine i'm scared of dropping it, especially when nothing lines up as it should. What i changed to is a rope that wraps around the front and back of the engine. I know it sounds stupid, but that's the way i do it. I did have a friend who dropped an engine with the carb plate lift and it broke the front crank jurnal, that's what changed my thinking.
I swore it would never hapen to me.
JMO
Zip.