When using either a plate or a chain, grade 8 bolts must be used to insure your safety. It is not recommended to use a lifting plate with an aluminum manifold. It is not recommended to use a chain when leaving the transmission connected to the engine.
The lifting plate bolts to the intake manifold and the chain connects it to the engine hoist for removing the engine.
At the end of the lift you can see the lifting plate attached to the engine.