Also, I think an engine leveller is critical.
I would agree. Looping a chain over a slip hook on a hoist is a recipe for disaster when the hook slips toward the lighter end of the engine.
At a minimum. Secure the hook to the center of your chain (with bailing wire?) Also, have enough chain in your loop so the pull is as vertical as possible. A real short chain multiplies the effective weight, pulling the attachment points toward each other. You don't want to bend or break your engine attachments.
