Where to ground engine?

Oh, mighty FABO, bless me with thy knowledge!

I've got a 360 that's currently completely isolated from the chassis. I've got the ignition and starter all wired up for the virgin startup but no ground yet.

Wherever I look, there's a gasket. Maybe I'm over thinking this, but where is the best, most common or stock place to ground the engine?

Since the starter is the biggest load by far, I'm thinking one of the starter mounting bolts would be a good place.

Can anyone advice me?