If at all possible, the best thing is to go to Brian's shop. Last I heard, the price of the transmission included installation if you can get to him.
If he has to ship to you, it'll show up in sort of a moulded case looking thing, mine did.
About a year and a half later, I paid him a visit to his shop. Brian pulled it & tore it down, inspected everything and upgraded it to all the current (at the time) mods he developed since I bought the tranny. My truck was still apart during lunch. So he took me along with him & his Mrs and bought me "vittels" since I was waiting. They're real decent folks.