One wire lock-up, 4 spd automatic w overdrive into A-body.

Here's a picture of this little known gem. It won't be long until there are post telling you what it is. If not, I'll spell it out soon.

Thread is pretty useless without a parts list.

Where's the bell housing and who makes it?

I'm pretty sure the cross member still needs quite a bit of work to put that in. No?

Have you ever done the swap before?