Muncie case repair

[big gear head]

Has anyone ever seen factory case repairs like this before? It was done before the case was machined. This is a 661 case. There are a few other spots that look like they had a little touch up.

What would this transmission have come out of? I've had it so long that I can't remember what the owner told me he took it out of. I think he said it was a Trans Am, but it was too long ago for me to be sure.