I've only purchased an item that size once. It was a transmission from canada.
The seller sent it through "Yellow transportation".
The shipping was a bit expensive, but it was a pretty simple process. They called me when they received the tranny, and asked if I would like it delivered to my address or if I'd like to come pick it up. It was easier for me to pick it up with my buddy's truck, so we went there that night, signed for it, and took it home.
A tranny can be lifted by 2 peole, though. With an engine, you're gonna need to find some way of transporting it safely to and from Yellow.
Try giving them a call. I'm sure they can help you out. Other than that, I wouldn't even know where to begin.