Water in Transmission...

We have a 727 in our 1973 Duster. Got a Griffin radiator with an AT cooler connected to the 727. We don't have fuel or spark set up yet, but bumped (not even a full revolution) a few times as we got the starter, etc. hooked up.

We were then working on the trans dipstick and when we pulled it out, water/trans oil came shooting out. Trans was full of water.

Disconnected the Giffin trans cooler and water came pouring out. Water poured in the radiator cap goes straight out of the two AT cooler connectors at the bottom.

1). Did we do something wrong? Thought it was pretty simple
2). Should we fly to south Carolina and hunt down Griffin?

And mostly, how do we flush out the trans ASAP?