Anyone recognize this 5 speed trans

It's in a car I'm looking at.. couldn't get a good look the day I was with it..going on a lift next week. This was a picture in the book of stuff about the car. The owner wasn't sure what it was, he didn't install it. Shifts really sweet.

Ballpark ..what is the rear gear ratio dropped to in OD with 4:11 rear, I know the tire diameter fits into the equation, just looking for ballpark figure.